An obnoxious teenager is pushed overboard and the crew and passengers of a cruise ship are on edge, including sixteen-year-old Carol Walters, who thinks she may be next on the killer's list. By the author of Winterkill.
I didn't realise this was part of a series before I borrowed it, but I thought I'd read it anyway. So Carol is working no a cruise ship for the summer, and a boy called Chuckie who was also working on it died. People thought it might have been suicide because he went over the side of the ship, but when his body washes up on shore, it turns out he's been stabbed in the back. Anyway, Carol goes ashore to the beach with some friends, and a girl called Kim tells her she has something she needs to tell her. Unfortunately, Kim ends up murdered too. Carol thinks she's in danger when she goes to her cabin and finds a dummy dressed in her clothes and hung in her bathroom. Everyone thinks it is this boy called Mick who had said that he liked Carol, but whilst he tries to claim his innocence, he ends up slipping from a railing and getting badly injured. It then turns out that Mick couldn't possibly be the killer because he was somewhere else when the murders took place.