Popular TV character Monk returns in this latest TV tie-in mystery book. Of all the things that make Adrian Monk uneasy, change ranks high on the list. So when Natalie completes her P.I. license and technically becomes Monk's boss it's not easy for him to accept. She asks him to spend a week with her on a cruise ship as she attends a business seminar at sea. But when the body of Mariah, the cruise director, is fished out of the ocean, it's up to Monk and Natalie to find out the truth about Mariah's unfortunate death.