Midnight's Lair is a 1988 horror novel by Richard Laymon, originally written under the pseudonym Richard Kelly. It was first published in Great Britain and was not released in the United States until 1993, where it was distributed by St. Martin's Press.
When eight people go on a cruise in the Bahamas, they plan to swim, sunbathe and relax. Getting shipwrecked is definitely not in the script. But after the yacht blows up they're stranded on a deserted island, and there's a maniac on the loose.
Donnerville librarian Jane Kerry receives an envelope containing a 50-dollar bill and a note instructing her to "look homeward, angel" and signed "MOG (Master of Games)." So begins The Game—pushing Jane into crazy, immoral, and criminal actions. When she tries to quit, MOG has other ideas.