November 1924. The glitzy and glamorous Endeavor sails from England to New York with 2000 passengers and a killer on board. When an elderly gentlman is found dead at the foot of a staircase, ship's offever Timothy Birch is ready to declare it a tragic accident. But James temple, a strong-minded inspector is certain there is more to this misfortune than meets the eye. Birch agrees to investigate and they form an uneasy partnership. Uncovering a web of surprising connections between the passengers aboard the Endeavor, running from the crew cabins belowdeck to the palatial suites of first class, their inquiries lead to the theft of a priceless painting. Its very existence is known only to its owner . . . and the dead man. With just days remaining until they reach New York the passengers continue to roam the ship with a killer in their midst. One who is poised to strike again.