Tom Lewis is murdered on his boat, five miles out at sea, whilst partying with girlfriend Sophie and her friends Lucy, Hema and Rachel. All the suspects alibi each other, while Lucy also tells Humphrey that she witnessed Tom make a secret phone call ... (more)and place cash into a moneybag, which has now gone missing. A button is discovered on the floor of the boat, but none of the suspects recognise it. The logo on the button links Tom to a bank in the UK. Humphrey, Dwayne, Florence and the suspects all fly over to England, where DI Jack Mooney assists them with their enquiries. As the team and Jack question the bank staff: Steve Thomas, Frank Henderson, Martin West and Dominic Green, they learn that Frank had a rendezvous with Tom before Tom died. Frank denies any knowledge of a meeting with Tom; Frank himself is then murdered.