Frank is put in danger when his dinner companion, mob lawyer Angelo Gallo, is shot; Danny is a juror in a murder trial.
Alex receives information about her father and his past at the FBI, and the recruits learn the art of profiling.
The NATs practise surveillance with Miranda and her troubled son. Shelby tries to keep Caleb at arm's length, while Raina allows Simon closer. Alex gets help when she tries to hack an FBI computer.
More questions arise when the Grand Central Station bombers are revealed. Back at Quantico, the recruits receive time off for the holidays.
FBI computers are hacked, revealing confidential files that makes Alex believe a second bomb is somewhere in New York. Meanwhile, the recruits receive individual assignments that turn out to be connected.