Melchior's detective work attracts the attention of the Inquisition. At the same time, there are increasing signs that not only Steffen, but also Melchior and Keterlyn are in danger. Their future together is at stake.

Keterlyn witnesses a brutal assault. The man's life is saved, but he has no memory. A ring at the crime scene leads Melchior on the trail of the secret brotherhood. But dark clouds are also gathering over himself.

Melchior receives a crucial clue from an old monk. The key to the ominous murders seems to lie in a tragedy involving betrayal, heartbreak and revenge. Keterlyn's secret also comes to light.

After the night watchman is haunted by a terrible ghost, he falls to his death from the tower. In addition, several people die in suspicious accidents, the investigation of which Melchior takes in hand.

After Melchior narrowly escapes an attack, he realises that someone is trying to mislead him. He has to hurry, because more and more people's lives are in danger. The pharmacist has growing doubts about his new apprentice.

When a famous knight is brutally murdered, the lord of the court commissions the young apothecary Melchior, who is rumoured to be able to talk to the dead, to investigate. To his surprise, the clues lead to a monastery.