English jazz pianist who witnesses Helga Ulmann's murder. He investigates the killings with Gianna Brezzi, uncovers a hidden mural and a walled room, and ultimately confronts and defeats the true killer, Marta.
Marcus is the sole eyewitness to Helga's brutal murder, linking him directly to the central mystery.
Gianna and Marcus form a partnership to uncover the truth behind the murders.
Once close friends, Carlo becomes an antagonist to shield his mother from investigation.
Marcus attempts to interview Amanda for clues before her murder interrupts the investigation.
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