Hans Baerlach is a Swiss police detective who has dedicated much of his career to pursuing powerful and allegedly murderous businessman Richard Gastmann. Though Baerlach’s partner meets his demise while investigating Gastmann, his replacement, Walter Tschanz, is undaunted. Meanwhile, the lovely Anna Crawley becomes involved in the case, which proceeds to take many twists and turns.

14th-century Franciscan monk William of Baskerville and his young novice arrive at a conference to find that several monks have been murdered under mysterious circumstances. To solve the crimes, William must rise up against the Church’s authority and fight the shadowy conspiracy of monastery monks using only his intelligence – which is considerable.