Andy is ready to get away for a much-needed long weekend when she and Gail, working a routine highway spot check, discover a teenage boy bound and gagged in the trunk of a car. The two find themselves plunged into a messy tale of young love gone wrong and must try to save the boy from making a tragic mistake. Meanwhile, Swarek, Oliver and Chris are hot on the trail of a gunman who shot a 16-year-old who may have gang connections.

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.