A forger known only as the Spanish Master has spent years selling fake antiquities into a market built on trust and thin provenance. The film follows the investigators, dealers, and scholars trying to trace his handiwork, unpacking how convincing fakes slip past auction houses and private collectors who want to believe what they are buying is real. Interviews lay out the forensic clues that eventually separate his work from genuine pieces, from tool marks to materials that do not match the supposed age of an object, and the story tracks how much money has changed hands before anyone noticed. Rather than treating the case as solved, the documentary leaves the conman's identity as an open question, framing him as a kind of phantom whose skill exposes just how little verification the antiquities trade actually demands. It plays out as part detective story, part indictment of an industry that prefers not to look too closely at what it sells.