Welsh Canadian globetrotting sleuth, and professor of criminal psychology, Cait Morgan, is supposed to be "celebrating" her fiftieth birthday in Jamaica with her ex-cop husband Bud Anderson. But when the body of the luxury estate's owner is discovered locked inside an inaccessible tower, Cait and her fellow guests must work out who might have killed him - even if his murder seems impossible. Could the death of the man who hosted parties in the 1960s attended by Ian Fleming and Noël Coward be somehow linked to treasure the legendary Captain Henry Morgan might have buried at the estate? Or to the mission Bud and his secret service colleagues have been sent to the island to undertake?