Cally is forced to re-think his future in the police force when he offers to provide a false alibi for John Sullivan's brother Liam, who is arrested on suspicion of shooting club bouncer Joseph Aherne. Despite Aherne himself naming Sullivan, and an off-duty police officer placing Sullivan at the scene, Cally refuses to change his statement. Hill is convinced that he has faked the alibi, and pushes Howard to expose him, but Howard refuses to let Hill's suspicions mar his faith. When an angered Pauli confronts him, he struggles to lie to her, and decides to tender his resignation. Despite a desperate plea from Howard, and an unexpected apology from Pauli, he refuses to change his mind. Meanwhile, Frank is weary at the impending arrival of Tomaszewski, but when he spots Jo and Tomaszewski in a passionate embrace, he begins to play the situation to his advantage. Realising that her actions may have spelled the end of Cally's career, Pauli decides to bury the hatchet. But will the pair ...