Teeth by Hannah Moskowitz

Set on a remote island, the story follows Rudy, a teenager who moves there with his family in hopes of finding a cure for his younger brother's illness. The island is known for its magical fish that possess healing properties, but Rudy soon discovers the island's darker secrets. He befriends a mysterious, half-human, half-fish boy named Teeth, who is caught in a cycle of violence and exploitation. As Rudy grapples with his own moral dilemmas, he is drawn into a complex web of friendship, loyalty, and the harsh realities of survival, ultimately questioning the true cost of saving a life.

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