Present Day: Yasmin needs more space, so she tears down a wall in her basement. But behind it, she encounters pure horror. Commissioner Oliver Bergmann investigates the discovery, which turns out to be the five-hundred-year-old skeleton of a nun. While the case is closed for his partner Klaus, Oliver follows a trail of fresh mortar. Indeed, he discovers the body of a young woman behind another wall. Her murderer had bricked her up alive, leaving her to die in agony. But the nightmare doesn't end there. Inside her abdomen is a coded message that leaves no doubt: he will continue to kill. Zons 1497: The young nun Brunhilde disappears without a trace one night. City soldier Bastian Mühlenberg initially believes she has run away from the harsh life in the convent. But then, a sister is found dead. As it turns out, she was...