Cassie Mayheim, mystery bookstore owner and self-anointed super sleuth, has solved every fictional case she's ever read. So when her best friend surprises her with an Alaskan WhoDunIt cruise for her fortieth birthday, she's ready to put her skills to the test. But the staged murder begins to feel all too real when Cassie senses danger lurking beneath the surface.

For seasoned cruise performer Hannah Garcia, the scripted mystery is just another day at work-until she stumbles into a deadly twist she never saw coming and her life is suddenly on the line. As danger closes in, the only person she can trust is Cassie, the captivating passenger she just met. But Cassie isn't just another tourist-she's Hannah's only hope.

As the ship sails deep into icy waters, they must unravel a mystery that's no longer a game-because this time, the killer isn't playing by the script.