In a remote place, there is a dilapidated and gloomy manor. Young detective Alex receives a mysterious letter and is invited to solve bizarre cases. It was already dusk when he arrived, and the old housekeeper welcomed him in anxiously.
The owner of the manor disappeared overnight without any clues, and strange noises were heard on the night of the disappearance. Alex searched and found that the master's study was in chaos, and there was a diary filled with strange symbols and cryptic words hidden in the corner.
During the investigation, everyone in the manor seems to have a secret. The butler's words flashed, the maid panicked, and the gardener fell silent. Later, he discovers a hidden secret room in the basement, with mysterious maps and experimental equipment hanging on the walls.
Just as Alex was exploring the secret room, there were footsteps behind him, and when he turned around, he saw the black shadow quickly disappearing. Alex knows he is trapped in a dangerous mystery, and the truth lies deep in the fog-shrouded manor.
