Harlee (Jennifer Lopez) struggles with becoming an FBI informant while Wozniak (Ray Liotta) suspects every member of his crew. Paranoid that Wozniak's search will lead to her, Harlee suggests polygraphing the entire crew, a plan that backfires. An appeals case sends Wozniak to watch tapes from his first encounter with Harlee, revealing a dark secret from their past. Meanwhile, Espada (Vincent Laresca) helps Tess (Drea de Matteo) deal with her husband's infidelity. Also starring Warren Kole, Dayo Okeniyi, Hampton Fluker, and Sarah Jeffery. Guest starring Gino Anthony Pesi, Santino Fontana, Annie Chang and Lolita Davidovich.