Eight days before the summer solstice, a solemn ritual of bloody sacrifice is performed in ancient Stonehenge, on the eve of the invasion of numerous lovers of meeting the most significant dawn among the mystical stones. A few hours later, a world-famous archaeological treasure hunter shoots himself in the forehead while sitting in his country house. But he leaves an encrypted message to his long-gone son, the young archaeologist Gideon Chase. Together with a fearless female detective from the Wiltshire police, Gideon exposes a secret society - an ancient brotherhood that has faithfully served the Stonehenge Sanctuary for millennia. Under the leadership of charismatic and ruthless new leaders, the cult, which had existed since the Stone Age, degenerated into a ritual of human sacrifice in the name of the favor of the mysterious forces that dwell in the sacred stones.