A young merchant in Renaissance Milan finds himself entangled in a web of suspicion and betrayal when he is accused of a crime he did not commit. Joachim von Sandrart, a merchant from the north, arrives in Milan seeking to settle a debt, only to be framed for the murder of a man he barely knows. As he navigates the treacherous social and political landscape of the city, he must uncover the truth behind the conspiracy to clear his name. The narrative unfolds through a blend of historical detail and psychological tension, capturing the atmosphere of Leonardo da Vinci's era.

This work is characterized by its precise, intellectual approach to the historical mystery genre. The narrative structure suggests a focus on the psychological burden of the protagonist as he navigates a world of shifting loyalties. Readers often note the author's ability to weave historical context seamlessly into a suspenseful plot. The prose style is typically described as lean and evocative, prioritizing thematic depth over excessive ornamentation. The book remains a notable example of how historical settings can be used to examine universal questions of justice and human nature.