Killer Cruise by Laura Levine is the eighth book in the Jaine Austen (Writer-for-Hire) mystery series. This is excellent beach reading. Levine has a great sense of humor, and she doesn't take herself too seriously. Instead, she infuses each entry with tongue-in-cheek observations, snappy dialogue, and Jaine getting herself into ridiculous situations...again. Jaine is a freelance writer, and she pretty much takes any job that will help keep Prozac in expensive kitty kibble. This time, she's thrilled to be offered a free Mexican cruise to fill in for the writing teacher who had cancelled. Her illusions are shattered when she's shoehorned into a closet on the Dungeon Deck with the other employees and meets her "students," one obsessed with Mary Higgins Clark (and she's the most normal). One writing exercise splits up a couple on the cruise to celebrate a milestone anniversary. And Prozac has ended up on board. To keep him quiet, Jaine agrees to read the porter's dreadful manuscript. It's the usual fun, wild ride until Jaine uncovers a murderer.
Source disclosure: I purchased this book.