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Count Scarlioni has the Doctor, Romana and Duggan locked in his basement but the trio manage to escape and learn of the Count's experiments with time travel. Even more surprising are his multiple genuine copies of the Mona Lisa.
While sightseeing in Paris, the Doctor and Romana find themselves repeatedly reliving the same moments in time. A visit to the Louvre Museum leads the Doctor to suspect an alien plot to steal the Mona Lisa
Travelling back in time to 1505 Florence in search of Leonardo da Vinci, the Doctor is surprised to instead find Count Scarlioni under a different name. Back in 1979, Romana and Duggan attempt to stop the Count's heist but arrive too late.