Gray is already bigger than all the other sharks in his clan, or shiver. He can't stop growing, and when his hunger gets him into trouble, he's banished from the reef with his best friend Barkley. Their hunt for food forces them to journey deep into Goblin Shiver territory, where they have no choice but to join the shiver. They'll help fight against rival sharks in return for training, protection, and food. But who can Gray and Barkley trust when the ocean is full of slippery fish and one mistake means you're someone else's dinner?