Every seven years, unusual horsemen appear from Cadbury Castle, which has stood in the south of England for thousands of years. This happens on the eve of the Celtic New Year - Halloween - the night of ghosts... Every ordinary person's veins would shake from such a sight - ghost horsemen in long robes, silently galloping across the plain - but not the real hero Indiana Jones! Having met the ghostly horsemen , he did not give up, but managed to travel with them through time, get to King Arthur and get the treasures he had hidden from the conquerors!