About the fast-paced Missing Persons Squad of the Federal Bureau of Investigation. The sole responsibility of this special task force is to find missing persons by applying advanced psychological profiling techniques. The team reconstructs a "Day of Disappearance" timeline that details every minute of the 24 hours prior to the disappearance, following one simple rule: learn who the victim is in order to learn where the victim is. Senior agent Jack...

Season four of this procedural drama about the Missing Persons Squad, a unique New York based FBI task force, finds Martin gravely injured in the line of fire and going through rehabilitation. Jack, Samantha, and Danny try not to let their concern for Martin hinder their efforts. Vivian's heart surgery appears to have been a success. Rookie, Elena Delgado, formerly of the NYPD, has joined the squad after Jack realizes the crisis plagued team needs...