Paul Delamare has been roped into accompanying his old friend on a luxury cruise aboard the magnificent superyacht Maldemer. It's all plain sailing until his friend's priceless necklace is stolen, and everyone falls under suspicion.
As Paul races to catch the thief, the ship begins to drift off-course, veering into the storm-lashed mid-Atlantic. Then one of the passengers is found dead in mysterious circumstances, in a pool of coffee and surrounded by cake crumbs.
It's all hands on deck to catch the killer, but Paul soon discovers guests and crew are harbouring deadly secrets. And if he can't get to the bottom of the mystery soon, he'll be sleeping with the fishes.
