Secret codes! Clues! Delicious red herrings! A classic whodunit on the high seas, where Sammy and her dad find themselves in some seriously shark-infested waters. This Sammy Keyes adventure finds the intrepid Sammy and her best friend Marissa at sea on a weeklong cruise to Mexico. The ostensible reason for the cruise i Sonlight resource: https://www.sonlight.com/products/sammy-keyes-and-the-killer-cruise