El gigante de los mares (Seawalkers, 4)

Blue Reef Academy is now Tiago's second home. Tiago, a shape-shifting tiger shark, is helping him get Wave, a humpback whale, admitted to the school. But Wave doesn't know much about the human world and involuntarily transforms, leading to trouble... with the police! Tiago, his friends, and his teachers have no choice but to turn to Lydia Lennox, the wicked lawyer, who sees this as her golden opportunity to finally seize control of the school. Will they be able to stop her?