Charles: The mastermind was ADA Greene. He didn't have enough evidence for the case. He was afraid he was gonna lose and needed someone to blame it on.
Captain Holt: Whom did he work with... Obviously someone who knew about the pranks and that Amy called Jake "babe."
Charles: Excellent question, Captain. It took a little digging to find that out, but I pulled some personnel files and combed through some social media. Do you know what Greene's wife's maiden name is?
Hitchcock: Duchovny?
Charles: No.
Hitchcock: Zappa.
Charles: No.
Hitchcock: Fagerbakke.
Charles: No, Booth.