Casey and Lacey Nicefolk seem like two regular American kids - but these twins have a secret: a magical box that can turn any small object life size! So they dream up a plan to turn a toy boat into the life size Hotsy Totsy and enter a national boat race. With their dog, Floopy, along for the ride, the twins zip up to San Francisco ready for excitement. But this is no ordinary boat; and this is no ordinary race. Casey and Lacey must work together in a nautical adventure that turns into a risky race to the finish line!