London, 1308. "All I need is a Plan!" So says Oswald of Harlech, a misplaced Welshman in the heart of London. Besides his trade as a tinker, he also robs houses, cuts purses, plays a crooked shell game, and has a way with the ladies. But this time, caught in the act of robbing a house, he is blackmailed by the scheming Keeper of the King's Wardrobe into stealing the Crown Jewels from the impenetrable Tower of London. Gathering his gang of friends - his half-wit companion who is uncannily adept at picking locks, his greedy landlord, a mad alchemist, a desperate but beautiful alehouse owner, and a man-of-few-words blacksmith - Oswald must steal the jewels, avoid the gallows, skirt some unscrupulous moneylenders, get the girl, and escape the sheriffs' clutches, all with sly wit and good humor. It's Ocean's 11 in the Middle Ages!