Frank contends with a potentially dirty cop within his ranks; Eddie and Badillo track down the culprits behind the theft of valuable, rare works from a celebrated bookstore; Erin snoops…

Green and Cassady follow the leads when a young boy is found murdered to a suspected serial pedophile/murderer.

A riot at an immigration rally ends in murder, and the political climate causes McCoy to assign a special prosecutor increasing tensions at the office.