Super-duper pint-sized snoopers Mary-Kate and Ashley pursue a second mystery aboard a vacation cruise ship when their father's top-secret computer disk, which c

Join one of the youngest crews ever to sail around the world in this fourth installment of the Worst-Case Scenario Ultimate Adventure Novel series! Faced with f

From the New York Times bestselling author of Evidence of Harm and Animal Factory—a groundbreaking scientific thriller that exposes the dark side of SeaWorld,

While on an ocean cruise with their family, Mary-Kate and Ashley try to discover who stole their father's top-secret computer disk.