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Tranquility Lane is the seventh main quest in Fallout 3, an Xbox 360/PC achievement and a PlayStation 3 trophy. The quest begins immediately after the completion of Scientific Pursuits as the Lone Wanderer sits in a Tranquility Lounger in Vault 112. The quest can also be accessed immediately after the completion of Escape! by entering Vault 112 after the Lone Wanderer leaves Vault 101.

Quick walkthrough

Main Quest: Tranquility Lane
Speak to Betty.
Activate the fail safe.
Make Timmy cry.
Break up the Rockwells' marriage.
Kill Mrs. Henderson.
Kill all of the residents.
Exit Tranquility Lane.
Speak to Dad.
Reward: 600 XP
Leads to: The Waters of Life


Tranquility Lane is a virtual reality simulation housed in Vault 112, created by Dr. Stanislaus Braun.[1] The Lone Wanderer is tasked with an escalating series of violent tasks ranging from making a child cry to killing residents. The tasks are given by a little girl named Betty, who in turn will free the Lone Wanderer's father, James, who is trapped in dog form.

As an alternative to completing the violent tasks, the player character may activate a failsafe, which will irrevocably kill everyone with the exception of Betty, James, and the Lone Wanderer. Both solutions result in the release of the Lone Wanderer and their father from the simulation.


The following are the residents that live in Tranquility Lane:

Betty's tasks

Betty will task the Lone Wanderer to do the following:

  1. Make Timmy cry:
    • By attacking him physically.
    • By convincing him that his parents are divorcing each other because of him, which he will believe after a Speech check.
    • By giving him the military school brochure to fool him into believing his parents are sending him away.
    • By killing one (or both) of his parents.
  2. Break up the Rockwells' marriage:
    • By telling Janet Rockwell that her husband is cheating on her, which she will believe after a Speech check.
    • By finding the lacy underwear in the Simpson household (upstairs on their bed), placing it on Roger's desk in the Rockwells' basement, then telling Janet that her husband is either cheating or he wears the garment.
    • By reading Janet's diary upstairs, which indicates that she'd like to kill Martha Simpson. Take the rolling pin from the kitchen in the Rockwell house and beat Martha to death with it, then tell Roger Rockwell about it. Note that reading the diary is optional. Skipping that part will not prevent completion.
  3. Kill Mabel Henderson. Betty indicates that Mabel must be murdered in a sufficiently creative manner.
    • The chandelier above the hallway to the kitchen can be rigged to drop when someone walks under it.
    • A roller skate can be moved to the stairs, resulting in her falling to her death.
    • Martha Simpson states that Mabel loves cooking. Her oven can be sabotaged. Upon being asked to make a pie, she lights the stove and an explosion occurs, killing her.
    • The security console in the kitchen can be accessed, allowing one to enable the security lockdown, locking Mabel in the house. Set her robot to "Begin Security Program" mode, and, as it wanders around, disable the "security parameters" data, rendering it unable to determine friend from foe. The robot will also be hostile to anyone it detects. If the robot is destroyed after it kills Mabel but before deactivating its security mode, the Lone Wanderer will not be locked in the house, deactivating the security on the terminal and will allow them to leave.
  4. Kill everyone: As Betty says, the Pint-Sized Slasher mask and Slasher knife can be found in the doghouse to the right of the abandoned house. At this point, everyone will become hostile and attempt to flee from the Lone Wanderer with the exception of Betty, the dog Doc, and the Mister Handy. After everyone is murdered, Braun expresses gratitude for the entertainment and tells the Lone Wanderer that Doc is actually their father, and has been watching them in horror the entire time.

Fail safe

Failsafe terminal

  1. Old Lady Dithers will tell the Lone Wanderer that she knows that Tranquility Lane is a simulation, that Betty is really "Braun", and that he uses a "fail safe terminal." She mentions that the Lone Wanderer should go and search the abandoned house.
  2. Within the abandoned house, the Lone Wanderer will find a set of objects that make specific musical pitches when activated. If they enter the proper sequence, the failsafe terminal will reveal itself. In the terminal, selecting "Chinese invasion" will summon a squad of Chinese commandos who proceed to murder the residents of Tranquility Lane, with the exception of James (as Doc the dog), Betty, and the Lone Wanderer. According to the notes on the invasion program, this program disables the failsafes on the pods, meaning that dying in the simulation will kill the real-world person as well.[2]
    The tone sequence is Radio (F), Pitcher (C), Gnome (D), Pitcher (C), Cinder Block (B), Gnome (D), Bottle (A).
    If one cannot remember the sequence to activate the terminal, note that each object has a specific tone, and Betty whistles the correct tonal sequence while playing in the center of the lane.
    The solution melody is a reference to Tranquility Lane's soundtrack. The theme is played multiple times by the xylophone and once by the flute: F C D C B D A. (fail: )
  3. If Braun is spoken to, he will angrily scold the Lone Wanderer on what they have done and lament that he is now alone and trapped forever within the simulation, something confirmed by his own notes on the Chinese invasion plan on the failsafe terminal. The systems in place for his own safety will not allow him to be killed, even if the invasion program is launched. He will further point out that Doc the dog is actually James, and he will be waiting for the Lone Wanderer once they leave the simulation.
  4. Using the exit door on the playground will end the simulation.

Outside Tranquility Lane

As soon as the Tranquility Lounger pod opens, James will walk to the Lone Wanderer and begin a conversation. He had intended to find some holotapes, memos, or even experiments from Braun related to the G.E.C.K., but what he found was Braun who trapped him in Tranquility Lane as a dog. James indicates he'll be returning to Rivet City to meet with Dr. Li and resume Project Purity. This ends the quest and begins The Waters of Life. Once Tranquility Lane is exited, it cannot be accessed again.


  • Making Timmy cry will result in a -50 Karma penalty.
  • Breaking up the Rockwells' marriage will result in a -50 Karma penalty, except by killing Mrs. Simpson and blaming it on Mrs. Rockwell, which will be a -100 Karma penalty.
  • Killing Mrs. Henderson results in a -100 Karma penalty except by using the roller skate, which is a -50 Karma penalty.
  • Killing people as the Pint-Sized Slasher causes -50 Karma penalty per person or -400 Karma total for killing everyone.
  • Activating the fail-safe rewards +300 Karma.

Quest stages

5 Find Dad.
10 Find and speak to Betty.
15 Make Timmy Neusbaum cry.
20 Report back to Betty.
25 Break up the Rockwells' marriage, without killing either of them.
30 Report back to Betty.
32 (Optional) Find and activate Tranquility Lane's Failsafe computer.
35 Arrange a creative death for Mabel Henderson.
40 Report back to Betty.
45 Retrieve the mask and knife from behind the Abandoned House.
50 Kill all the residents of Tranquility Lane.
60 Report back to Betty.
70 Exit Tranquility Lane.
75Quest finishedTalk to Dad.


  • Betty will kill the Lone Wanderer with an electricity/pulse blast upon being attacked, or if one shoots at her surroundings. This happens even when the fail safe has been activated and despite Betty says that she has no control over them.
  • The Lone Wanderer's Pip-Boy is removed while in the simulation, replaced by the Pip-Boy style watch; however V.A.T.S. still works as intended and the wait function progresses time as normal.
  • The background music of Tranquility Lane will become slightly lower in pitch after activating each individual object required to access the fail-safe.
  • The main musical theme heard in the simulation can be heard as a nursery music box tune during the tutorial quest Baby Steps.
  • Drinking water inside the simulation will restore real-world health, also the water is rad-free.
  • After making Timmy Neusbaum cry, he will turn into a garden gnome and appear by the front door of the Neusbaum residence. The gnome can be activated, but does nothing.
  • There are a few items which can be taken and placed in one's inventory. In the basement of the Rockwells' house there are two large cooking pots that can be looted. Taken items can't be used in the simulation, and upon exiting, they are removed from one's inventory.
  • Early in development, the Lone Wanderer would instead place a frag mine in the oven, however the copy of the pristine frag mine mesh that it uses, is deleted.[citation needed]
  • The Chinese commandos spawned by the fail safe are marked essential, and cannot be killed (only knocked unconscious). Any crippled limbs will return to full condition when they stand once more. If attacked with one's fists, they will not retaliate but if a weapon is used, they will become hostile.
  • When leaving Tranquility Lane after activating the fail-safe and then reading the resident status terminals, they all display:

Pulse: 0 bpm
BP: 000/00 mmHg
Temp: 85 F
Respiratory Rate 0/min
Stress Level: No Reading

  • Screenshots taken in the Tranquility Lane loading screen will show up in full color.
  • It is possible to re-enter Tranquility Lane after the quest is completed. By going outside the room of Vault 112 using the tcl command, one can find a door that goes to Tranquility Lane. One will be able to access gear normally.
  • When exiting the simulation, James is wearing his Vault 101 jumpsuit even though the Lone Wanderer is not allowed to enter the simulation without wearing a Vault 112 jumpsuit.
  • If one tries to loot a dead resident in Tranquility Lane, they will get a message saying that they cannot tamper with bodies in the simulation.

Behind the scenes

In an August 2020 interview, Emil Pagliarulo, who worked on Tranquility Lane, and Jeff Gardiner, the lead producer at Bethesda Game Studios, both stated that they consider Tranquility Lane to be one of their favorite quests throughout the Fallout series. Gardiner cited Tranquility Lane as a good example of the dark humor in Fallout, as well as how even the most outlandish of concepts can work within the Fallout universe. Pagliarulo went on to talk about how the ratings system in the United States, specifically the limitations on killing children, influenced what could and could not occur in the Tranquility Lane simulation.[3]


  • Playstation 3Playstation 3 Xbox 360Xbox 360 Mrs. Rockwell can skip the argument with her husband if you decide to use the lacy underwear. She will just run away when she's within speaking distance of her former husband. One way to avoid this is to exit the basement before she does and make sure Mr. Rockwell is not too close to the basement door.[verified]
  • PCPC Playstation 3Playstation 3 Xbox 360Xbox 360 Your follower may not return to their original location upon entering the simulation, and instead disappear. Sometimes they can be found in the pod area later on.[verified]
  • Xbox 360Xbox 360 If Mabel Henderson is not in her house, or leaves during the time you are arranging her creative death, she may not return. You may need to disable the security lockdown and find her, you may kill her and Betty will restore her to her house, otherwise you may have to load another save.[verified]
  • Xbox 360Xbox 360 If you become hostile with one of the residents and get a fair distance away from him/her you will hear your character say "I guess it was nothing" in a child's voice.[verified]
  • Playstation 3Playstation 3 Xbox 360Xbox 360 When you check your watch in Tranquility Lane, the game may freeze.[verified]
  • PCPC Playstation 3Playstation 3 Xbox 360Xbox 360 If you start the Chinese invasion while trying to break up the Rockwells' marriage, they will survive because they can't die during that quest. [verified]
  • PCPC Playstation 3Playstation 3 In very strange cases the fail-safe will not appear in the abandoned house. [verified]
  • PCPC The game may crash upon starting the fail-safe. [verified]



  1. Tranquility Lane terminal entries; Vault 112 Auxiliary Command terminal
  2. Tranquility Lane terminal entries; Failsafe Program Documentation
  3. Bethesda_DE: Interview with Jeff Gardiner and Emil Pagliarulo at Gamescom 2020 (reference starts at 00:55:18):
    Alina Ullrich: "So, there's a question about your favorite quest ever made in the Fallout universe."
    Jeff Gardiner: "It's gotta be... COVID has affected my brain, sitting home all day... the black and white one -"
    Emil Pagliarulo: "Oh! Tranquility Lane. In Fallout 3."
    Jeff Gardiner: "Yes, that's it. Tranquility Lane. Yes. I'm sorry, I just..."
    Emil Pagliarulo: "That actually might be my favorite too, that was... that was really fun."
    Jeff Gardiner: "Fallout 3, when you go into the, yes, in Tranquility Lane. And the kid - the Pint-Sized Slasher. I just - that is the perfect example to me of the dark humor. And you can do anything in the Fallout universe, pretty much, and make it work. And they, Emil and they did. And it's still to this day, where you go 'wow.'"
    Emil Pagliarulo: "Yeah. Blowing up Megaton, that whole quest, probably... you wanna know, here's some trivia about Tranquility Lane. So, in the ratings system in the United States - you can't kill children, right? There was a big limitation with killing children. In Fallout 3, there's only one place that a kid can die. And that's in the Tranquility Lane simulation. And it wasn't okay to kill a kid in a video game, but it was a simulation within the video game. It was okay for a kid to die in the simulation in the video game, because he wasn't a real kid."
Tranquility Lane