When Billy Pope’s girlfriend is found murdered on the eve of giving evidence at an inquiry into police corruption, Internal Affairs comes after Frank believing he tipped off the killer as to her whereabouts. The conflict between Tommy’s father and the Rispoli family escalates and brings Tommy to the verge of taking the law into his own hands. The dive team are called upon to retrieve the body of an amateur diver from an underground cavern but the recovery effort is called off for safety reasons when Terry is injured in an underwater rockfall.