On the way to answering a mayday call the Hammersley rescue ex-Navy Lieutenant Geoff Kershaw who's boat had capsized. When they reach the location of the mayday call they only find Matt & Simone Robsen's boat deserted but loaded with weapons. They search the nearby island and find Matt & Simone tied up who tell them that some men tied them up and left them there. Hammersley let NavCom know the serial numbers of the weapons who advise them that a dangerous ex-Navy man Shane Davis had stolen them from an Army base in Darwin months previously. Mike leads two teams to capture Davis and eventually capture them and transfer them to the Hammersley. But is the trouble really over?