Fontana and Green investigate when a bank manager is involved in the robbing of his own bank and learn that his daughter is being held hostage and that he had to go along with the robbery or risk losing his daughter. One man is killed in the robbery, but the two detectives track down his accomplice and, while alone with Mitchell Lowell, Fontana uses extreme force to get the answers he needs, prompting Lowell's lawyer to claim that all the information Fontana obtained is fruit of the poison tree. McCoy works to fight the claim of police brutality while also trying to find a way to get around Fontana's actions.

After undercover cop Dana Baker is murdered, Fontana and Green learn that the man who killed her had discovered her identity after seeing a photograph of her in the paper revealing her as an undercover police officer, not the heroin dealer she was posing as. Investigating the story leads detectives to Eric Lund, one of the workers in Congressman Prescott's office, but Lund seems to have an ironclad alibi after an e-mail he sent comes to light.