Where is the fingerprint in you spy mystery?

In a spy mystery, the fingerprint could be a crucial piece of evidence found at the scene of a crime, such as a clandestine meeting or a secure location. It might belong to a key suspect or an unexpected individual, leading the protagonist on a chase to uncover hidden connections and motives. The fingerprint serves as a tangible link to unraveling the plot, revealing secrets that could change the course of the investigation.