Frank was quiet about his background with Phil and Sparky, and he has no desire to tell the Prisoner where he came from. Frank does, however, like to do business in his highly trapped shop. He also carries the detonators for a large number of explosives all around the surface of Burham Springs and is the smartest person in town, a fact which the other two are well aware of. He is weird, quirky, won't be pushed around and can dish out plenty of pain on those who cross him or his allies.
When he's not in his shop, he can be found salvaging in the mines. He usually salvages during the day, when Phil and Sparky are on the surface. If trouble starts, though, he will emerge to deal with troublemakers.
New Canaan Connection: Jeremiah wishes to enter into a trade agreement with Phil, Sparky, and Frank. However, he is concerned that the trio at Burham Springs may fire at will on the New Canaanites if they approach, so he would like the Prisoner to negotiate on their behalf.
The explosion upon blowing up the entrance to the mine is loud enough that it can be heard at Phil and Sparky's place as well as Frank's place. The trio will investigate and attack the Prisoner and any companions.
Frank and Phil will more than adequately warn the Prisoner that the mine is extremely dangerous. Frank owns a map of the extra toxic areas in the lower caves, but he will not part with it unless the Prisoner is willing to pay a high price.