Hy Conrad - Monk 17 - Mr. Monk Gets on Board

Book 17 - Mr. Monk Gets on Board: 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. Nor can he accept Natalie attending a business seminar at sea without him, even if it means spending a week with her on a cruise ship.
When the captain hires Monk and Natalie to look into a mysterious rash of vandalism onboard, Monk steers the investigation toward murder…