Being a teenager is never easy. Especially when you can talk to sharks! Tristan Hunt has enough to worry about with girl troubles, his parents, and trying to keep his extraordinary abilities a secret. But when Tristan and his friends are called upon to investigate the disappearance of stingrays and other ocean life in the waters off Grand Cayman, the stakes are higher than they've ever been before. Can Tristan solve the mystery of the missing stingrays and save them from a horrible fate? Or will he and his friends become the stingray-napper's next victims? Join Tristan Hunt and the Sea Guardian on their most dangerous adventure yet.