A self-doubting teenage humpback whale, grieving the loss of his parents and the legacy of his father, the legendary last Whale Singer, must rise to a destiny he doesn't believe he can carry. When a monstrous creature escapes from a melting iceberg and threatens the oceans, he and his friends descend into the darkest depths to find the mystical song that could save their world, in a coming-of-age story about grief, self-belief, and finding one's voice.