A young backpacker is found dead from a gunshot wound in her hostel bathroom. It seems like a suicide - but Humphrey can't work out why anyone would bring a wash bag into a room where they planned to kill themselves. Suspicion falls on the only people near the hostel at the time of the gunshot. The investigation leads Humphrey to discover an old crush from London is on the island - and that life at the hostel is even murkier than anyone wants him to believe. When Sian's phone is recovered, it seems like she might have had some secrets of her own.