Mickey Spillane? Yes, with a straight, conventional boys' adventure about the day the sea mysteriously rolls back, baring stretches of sand never before exposed. Fourteen-year-old Larry has grown up on a small Caribbean island, the site of his father's search for a fabled treasure ship. Now his father is in Florida seeking funds and the greedy inhabitants of the next, larger island are swarming about in search of the same treasure. Larry and his Carib friend Jeff go exploring too--and are chased throughout the day by two men who have previously sunk Larry's father's boat and now must kill the boys to keep their secret. Between close calls the boys do find the treasure, and though they won't be able to locate it later, the souvenir rock they bring home turns out to be ""one of the biggest uncut diamonds in the world!"" With Larry's father flying to the rescue as the pursuers close in and the sea seeps up, it's good for some suspenseful moments.