Every parent's worst nightmare is just the beginning for Rachel's ordeal as in the aftermath of a tragic accident, she and her husband Anthony decide to move to the other side of the world to focus on their surviving twin son Elliot. What begins as a time of healing and isolation in the Finnish countryside turns into a desperate battle for the very soul of their son as an entity claiming to be his dead twin brother takes over Elliot — setting Rachel on a diabolical journey to unravel the horrible truth about her twin son.
In medieval Tallinn, a famous knight who is freed from the pirates of the Baltic Sea is murdered. The hero's head is cut off and his mouth is stuffed with coins. The gold chain he bought the same day is missing. The bailiff orders Melchior, an apothecary, to investigate the crime. The clever young man discovers that the slain was looking for a mysterious "Tallinn prisoner" and the traces lead to the Dominican monastery. A fabulous sequence of bloodwork is unleashed - anyone who comes into contact with this secret is in danger of dying.
In the middle of the night, a drunk town guard happens to meet the daughter of a rich merchant… who drowned herself into a well 10 years ago. Soon after the town guard falls dead from the tower. This is followed by two other suspicious deaths. Doubting the existence of the ghost, Melchior has a hunch that these ‘accidents’ are part of a heinous crime. Tracking down the killer, his path will cross with heretics, old feuds and dark family secrets.
