In a spirited response to the government's attempt to curtail alcohol sales, Humphrey Pump (called Hump) - a pub owner in the fishing village of Pebblewick - takes to the road in a donkey cart. Accompanied by Captain Patrick Dalroy, a crimson-haired giant with a tendency to burst into song, Hump provisions the cart with a cask of good rum, a giant round of cheese, and the signpost from his pub, The Flying Inn. Together, the two men extend good cheer to an increasingly restless populace as they attempt to evade Prohibition. In a journey that becomes a rollicking madcap adventure, the two travel round England, encountering revolution, romance, and a cast of memorable characters.