Tova Sullivan's routine life as a night-shift cleaner at the Sowell Bay Aquarium takes a remarkable turn when she forms an unexpected friendship with Marcellus, a shrewd giant Pacific octopus residing within the glass tanks. Mourning her husband and haunted by the unresolved disappearance of her son thirty years prior, Tova finds solace in her aquatic acquaintance. However, Marcellus is no ordinary octopus; he harbors the surprising secret to the mystery of Tova's lost son. Using his cunning intelligence and invertebrate skills, Marcellus embarks on a mission to reveal the buried truths before time runs out, weaving a heartwarming tale of connection and the transformative power of companionship.