Tuğba is a young woman who lost her parents in mysterious circumstances many years ago. Tuğba, who is pursuing a master's degree in archaeology, comes across traces of an ancient sect called Humruz while conducting her research in the vicinity of Derinsuyluk village. Determined to investigate this matter, Tuğba sets off for the region with the guidance of her brother Selim and her advisor. Arriving at the region late at night, Tuğba is forced to confront chilling truths.