A violent storm rages over Runowo. The villagers believe it is the work of the Slavic "devil's wedding", when demons revel in the sky, sending madness and death down upon people. The next day, Inspector Sambor Malczewski and his dog, Terror, search the forest. In an old post-war bunker they come across human remains. It soon emerges that they belong to Beata and Julian Wilczek and their daughter Klara – a family who vanished without a trace twenty years earlier. Malczewski suspects that Andrzej Robotnik may be responsible for their deaths – a man who, years ago, murdered his wife, son and mother-in-law, then fled deep into the Gorzów Forest. Soon another gruesome murder takes place, and panic breaks out among the people of Runowo. What really happened in the old bunker? Did the Wilczeks fall victim to the fugitive murderer? And who is now spreading terror among the villagers, when the demons in the sky have fallen silent, but the human ones are only just awakening?