Following Wozniak's (Ray Liotta) discovery that Stahl's (Warren Kole) target is his close friend and Mayoral Candidate, Julia Ayers (guest star Anna Gunn), Wozniak launches an all-out war with Stahl.
Meanwhile, Harlee (Jennifer Lopez) dives into an investigation that takes an unexpected turn into her own past - and ultimately throws her in the cross-hairs of Wozniak and the FBI. At the precinct, a new, unwelcome presence threatens to uncover the crew's deepest secrets.