'People will die,' says the panic-stricken woman outside police headquarters. Her daughter has seen a vision: ghostly horsemen who target the most nefarious characters in Normandy. Although the case is far outside his jurisdiction, Adamsberg agrees to investigate the strange happenings in a village ...

'People will die,' says the panic-stricken woman outside police headquarters. Her daughter has seen a vision: ghostly horsemen who target the most nefarious characters in Normandy. Although the case is far outside his jurisdiction, Adamsberg agrees to investigate the strange happenings in a village terrorised by wild rumours and ancient feuds.