Jessica Fletcher is aboard the legendary Queen Mary II for a transatlantic voyage, but it looks as though a deadly mystery involving a valuable diamond and its murdered owner has followed her up the gangplank. nJessica Fletcher has always wanted to take a transatlantic voyage on the legendary Queen Mary 2. Now, shes finally getting her chance. But when the investigation of a stolen diamond follows her up the gangplank, she must try to enjoy the sumptuous seaborne surroundings while searching for a priceless diamond-and the person desperate enough to take a life for it.