Double knot

"Super Spy Davis Way sets sail on a Caribbean cruise aboard the MS Probability with fifty billionaires, a boatload of Louis Vuitton luggage, Anderson Cooper, and her mother. (Her mother?) The weather is perfect, the seas are calm, and Suite 704 is spectacular. Until the door slams shut. For good. Obviously, it's a system glitch. Surely someone will show up to free Davis, Miss Hawaii, and the creepy staff. But when the minutes turn to hours and th...