In the third film of the medieval thriller, Melchior's wife, Keterlyn, witnesses a brutal attack. The life of an unknown young man is saved, but the victim, having lost his memory, does not know who he is or how he ended up in Tallinn.

A ring found at the scene leads Melchior to the Night Brotherhood, while the bizarre troupe that performed on Fair Day also raises questions. Frightening signs suggest that not only is the unknown survivor still in danger, but so too are Melchior and Keterlyn, who are treating him.

At the same time, the pope's envoy — known as a ruthless witch-hunter — arrives in the city.