Mona, having lost her newly born child, decided to drown herself. She went to the Oka River and jumped from the bridge into the river. Opening her eyes underwater, Mona saw... a man with a metal trunk in his hand. She woke up in the hospital. It turns out that when she was pulled out of the water, Mona was tightly clutching a metal trunk in her hands. From that moment on, she became the object of close attention from the authorities. Having told the police that the case belongs to her, she goes to the address indicated on the envelope found inside the case. In a luxurious cottage, she discovers two small, hungry children and a teenager, Kolya, who claims that this is his uncle’s house and that when he arrived, he found the corpses of his uncle and his wife there. While he ran to call his parents, the corpses disappeared. Mona and Kolya remain in the house. Everyone is in their own hell. But they don’t even suspect that the most terrible and incredible thing in their life is just beginning...