Following reports that an unscrupulous marine park has dumped an unwanted young dolphin into the sea, Ben and Zoe are on their way to the Caribbean. Having been raised in captivity, the dolphin is ill-equipped for life in the open sea and soon finds itself in dangerous waters. It's up to Ben and Zoe to guide it to safety. This is a thrilling series for children passionate about endangered animals and the environment, but who also love action, adventure and gadgets.