When the ship sails on, death follows in its wake. What if you witness a murder on a cruise ship? How long before the killer tries to silence you too - forever? It's the 1960s and Margaret Hargreaves is newly on board the SS Ocean Star as a laundry maid. Her nightmare begins when she mistakenly enters the wrong cabin after a party. What she sees could be enough to send the murderer to jail for life. Which...