Wave Riders (Dolphin Twins Book 2) by Anh Do

The epic new adventure series from best-selling author Anh Do continues! Twins, Noah and Skye split up and continue their dangerous search for answers. As Noah discovers kids held captive aboard a ship, Skye and the dolphins make some new friends of their own. Can they outsmart the soldiers on patrol and uncover new clues to solving the mystery of what happened to their mum?