Mystery! Action! Songs! Join Detectives Mary-Kate and Ashley as they undertake daring adventures. Pack your gear and help the Trenchcoat Twins investigate the danger that lurks. Along with their sidekick dog, Clue, Mary-Kate and Ashley promise to "solve any crime by dinner time." In The Case of the Sea World Adventure, our super-sleuths take the deep plunge to discover a watery mystery. And what a truly whale of a tale they find when they discover some of the most remarkable creatures in the sea!