Blind Spot (S06E01)

When the body of a former Ambassador's daughter is found brutally murdered in her uptown home, Detectives Goren (Vincent D'Onofrio) and Eames (Kathryn Erbe) question a jealous ex-boyfriend.  But when another body shows up with a similar crime scene, Detective Goren's old mentor (Guest Star John Glover) and his daughter (Guest Star Martha Plimpton) suddenly return to warn of a past serial killer back on the loose.  The search gets personal as a member of the Major Case Squad is kidnapped. (iTunes)