Nick is inspecting an abandoned ship in the harbour, which is to be scrapped, looking for equipment that can be salvaged and reused. Whilst searching the rooms he is knocked unconscious by an escaped prisoner, Roy Burke. Burke has been jailed for murder, although he claims he is framed. He is out for revenge against those who betrayed him. Nick is held prisoner but offers to help him prove he is innocent. He enlists the aid of Fox to look at the evidence and find the real criminal.