Novels set in South Florida and the Keys are basically a sub-genre of popular literature today, but Theodore Pratt was one of the earlier writers to continually set his work there, using the area for thirty-five novels. Mercy Island involves a group—local captain, youthful crewman, hard-headed sportsman, and beautiful wife—who are stranded  on a deserted island when their fishing boat runs aground. But the island isn't empty. It's occupied by a man with a criminal past who has been hiding out there to dodge the law. As tensions rise and food runs short it becomes less clear who is the real danger to the group. Originally written in 1941, the book was immediately made into a hit movie starring Ray Middleton, Gloria Dickson, and Otto Kruger. This Dell paperback appeared in 1954 with uncredited cover art.