Sian Evans is found shot dead in her backpacker's hostel showers. With a gun in her hand and her body slumped against the door, it all points to suicide. All the hostel residents are on a boat tour, except for her boyfriend, the manager, a woman missing from her home in Wales and Leo, a recent arrival. Humphrey and the team discover they all had a motive to kill Evans. The only clues are her toiletries laid out and her missing towel. JP marries Rosey Fabrice and Humphrey meets an old girlfiend.