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.