Most mermaids jump at the chance to live on land. Except Laila. Terrified of humans after the attack on her mother, Laila joins a diplomatic mission to the siren community in the Atlantic Ocean to stay beneath the surface. But when the welcome she receives is colder than the surrounding seas, Laila learns that her own kind can be far more frightening than any man. As secrets are revealed and sirens infiltrate the human population, will anyone be safe on land or sea?