Chris' reunion with his rookie family takes a shocking turn when his son, Christian, is kidnapped while in Andy and Nick's care. As the squad spreads out to search for the boy, Swarek is confronted with Andy and Nick's budding relationship. As our officers discover clues to the identity of Christian's abductor, Chris is slapped with a stunning revelation that might tear his new family apart.

When a suspected pedophile is found severely beaten, Andy discovers that Marlo has been carrying out an all-out, unauthorized investigation into the man. Andy and Swarek must scramble to cover for Marlo's unprofessional conduct before she is exposed. Meanwhile, Traci oversees a major drug sweep, assisted by Chloe, Nick, Dov and Gail, but when Sam leaves his post to help Marlo, the operation takes an unexpected turn.