A single mother follows in the footsteps of a mysterious sect. A detective thriller set in the autumnal setting of Karelia, based on real events. On a rainy night, a young mother entered the forest with her baby in her arms and disappeared. A search organization volunteer, Anna Smolina, a woman with a difficult past who is raising her adopted daughter alone, goes in search of her. Anna does not suspect that by taking a step into the dark forest, she will set in motion a series of terrible events that will endanger the life of her daughter, as well as the life of thousands of innocent people.