Perry and his chum Henry go on vacation with their families and intend to do research into the legend of the lost city of Atlantis and its connection with America. They investigate in the library and on the internet to unfold the story passed down from Plato about this magnificent place. They even take scuba diving classes with an expert in order to be able to dive off the waters of Florida in search of artifacts and ancient remains of a city that was destroyed thousands of years ago. What they find convinces them there is truth to the story. However, they run into scholarly opposition that questions the idea as merely mythical–leading Perry and Henry to a public debate as to whether Atlantis was just a fantasy or not. Worse, they are stalked by treasure-hunters who are determined at all costs to keep what they know about the mysterious waters off Florida a secret! Perry and Henry find themselves in deep water and danger as they get closer and closer to the truth!