Nuclear conflict. He has long kept all humanity in fear. London is destroyed. Residents were either killed or mortally wounded. Nuclear dust is slowly settling. The survivors took refuge under the ruins. But another enemy lurks below, underground. Insidious parasites that have been living in its depths since time immemorial... Rats, these demonic offspring of irradiated ancestors, are patiently waiting. Instinct tells them that the balance of power is broken: the person has weakened and turned into prey. They are cruel and aggressive. They attack and take revenge. They are merciless in their fury, like the very weapon of destruction. The survivors move under the ruins. They fight with their own kind and with the beast. And all in order to comprehend the mystery of the destruction of humanity, a monstrous mystery that contradicts reason itself.