Gilbert and Sullivan are two inhabitants of a small archipelago in the middle of the ocean, where the residents live in floating houses, each with its own small dock. Sullivan is a musician who plays the fiscorn. He practises and rehearses tirelessly on the dock of his house, but one day his instrument breaks. Gilbert is the archipelago's postman, and every morning he punctually delivers the packages that arrive from the sky. But one day something different happens. Inexplicably, that morning Gilbert shirks his duty and decides not to deliver the box to its recipient.