Not far from Hildesheim, in the year 1234. On their journey to Cölln, the Arab Osman and his friend Robert the Slim stop at an inn. Here they meet Adara, a red-haired beauty. Robert is immediately enchanted by her, and a night of love ensues with far-reaching consequences: the next morning, not only is there no trace of Adara, but also of the money belonging to the two friends. Completely broke, Robert and Osman decide to follow the thief. The trail leads to the imperial city of Goslar and deep down into the silver mine...