01/21/2015 (10:00PM - 11:00PM) (Wednesday) : INTELLIGENCE IS FORCED TO SORT THROUGH A COMPLICATED WEB OF CLUES SURROUNDING THE MURDER OF A MOTHER AND HER DAUGHTER. Bob Ruzek (guest star Jack Coleman) is the first to arrive on the scene of a double murder. Intelligence arrives to take over the investigation tensions arise as Bob needs to hand over the case to his son (Patrick Flueger) and Voight (Jason Beghe). Lindsay's (Sophia Bush) new gig has her planning a trip to Bolivia for an undercover investigation that could be for an extended amount of time. Burgess (Marina Squerciati) and Roman (Brian Geraghty) realize they need to put past events behind them so it doesn't jeopardize them going forward. Jon Seda, Jesse Lee Soffer, Elias Koteas, LaRoyce Hawkins, and Amy Morton also star. Guest starring David Eigenberg, Bailey Chase, Alex Manette and Patrick Mulvey.