Based on the true story of a remote Scottish community on the Hebridean island of Scarp that became enchanted by a dashing German rocket scientist, Gerhard Zucher, and his plans to link them to the outside world during the late 1930s. Their mission is to build a mail rocket to help revolutionize the postal service between the island and its neighbouring communities. The building of the rocket, even after an initial failed attempt, soon becomes a community effort and eventually creates a unique bond between Zucher and the island's inhabitants.