There are several mysteries tied up in this gripping, sea-faring tale - apparently based on the real-life story of the Mary Celeste. A schooner is abandoned in the south seas and discovered by a naval vessel. Everything aboard the ship is intact but the crew is missing. Even more curious, two salvage parties put aboard the craft and also disappear. One survivor from the schooner is found adrift and gives an account of mutiny, murder and piracy, but there's an even bigger mystery to be solved.