The investigation of a missing girl is linked to a possible copycat of one of the squad's most gut-wrenching cases. Detective Luke Callaghan is brought back to 15 Division to help capture the abductor. With the clock ticking, Gail is forced to confront her worst fears in order to help solve the case. Meanwhile, Traci realizes she must move past Jerry's death, and Andy and Sam work together again, coming face to face with their past and the real reason for their breakup.