It’s the first day of summer holidays and Finn can’t believe his marine biologist mum is dragging him off to cold, rainy Scotland while she studies the whales that live there. 

Finn longs to be somewhere hot, lying by a hotel pool. He’s sick of his mum’s work, and of the knot in his stomach whenever he thinks about plastic-polluted oceans. But when a girl with binoculars round her neck and a dog at her heels takes him to her secret lookout point, Finn soon finds himself on an unforgettable ocean adventure…