The holodisk can be found in the Cambridge Police Station.
Captain Widmark: Hello team. Captain Widmark, here. Welcome to the task force. Operation Winter's End starts now... with you. Together, we will knock Eddie Winter off his throne and dump his sorry ass in a 2000-volt easy chair. It should come as a surprise to no one that our operations in Boston have been, in a word, compromised. Winter has eyes everywhere - even the BPD. So, our brothers across the river in Cambridge have been kind enough to let us use the Cambridge Police Department as our base of operations. Let's get to work. Good hunting.