Lenny, a curious young lobster, lives a peaceful life among the colorful tide pools and swaying kelp forests of his ocean home. Although comforted by the familiar rhythms of the sea, he yearns for something beyond-the unknown that lies past the reef's edge. One day, chasing a school of sardines, Lenny is suddenly swept away by a powerful current and pulled into the vast, unfamiliar ocean. Lost and frightened, he drifts through strange waters, encountering bioluminescent creatures and shadowy depths, until a distant, flickering light appears on the horizon-a lighthouse's beacon shining from a rocky cliff. Drawn to its promise of safety and direction, Lenny pushes through the current toward the shore, determined to find out what lies beyond his small world.

At the lighthouse, Lenny meets Captain Gray, a wise old seagull who watches over the sea from his perch atop the cliffs. The beacon that saved Lenny, once a reliable guide to countless sea travelers, has begun to flicker and fade, troubled by forces unknown. As the two unlikely companions talk, they uncover a growing mystery tied to the ocean's balance and the deeper shadows threatening it. Though small and far from home, Lenny feels called to help-to uncover what is disturbing the light and restore its steady glow. With courage sparked by friendship and a longing to protect what he loves, Lenny's journey transforms from one of survival into a quest to save the very heart of the sea.