In a kingdom where the king is forever away on hunts, a restless queen desperate for a child strikes a pact with a devil and soon gives birth to a princess. Raised alongside Štěpán, the chambermaid’s son, the two fall in love, until it’s revealed that on her eighteenth birthday the princess must be wed to Lucifer, so the queen throws a grand ball to betroth her instead to a foreign prince and thwart the infernal bargain.