The ocean is a vast, beautiful place filled with colorful coral reefs and dark, cozy caves. But for a tiny yellow octopus named Milo, something does not feel quite right. The moment he hatches from his egg, he has a sneaking suspicion that he is missing something very important, even if he cannot figure out exactly what it is. Determined to solve the mystery, Milo sets off on a grand underwater adventure. He swims down into the deep sea to explore fascinating sunken shipwrecks and travels across the vast ocean from shore to shore. Along the way, he meets all sorts of friendly faces, from graceful jellyfish to wandering polar bears. But no matter how far he searches, he still feels like a piece of his world is absent. Join Milo on his journey as he finally discovers the missing piece of his heart in this rhythmic, comforting aquatic mystery.