The epic adventure series from best-selling author Anh Do continues! Finally free of the Dray, Noah and Skye race towards Shipwreck Bay -their mum’s last known location. There, they find an old marine park. It looks abandoned, but sea creatures still circle the enclosures … and the Braxans are on patrol. Danger lurks above … and below the surface. Can the Dolphin Twins break in and find answers?