Master Pierre-François Chaumont, a brilliant Parisian lawyer, is a passionate art collector who never misses an auction. One day, he cannot take his eyes off an old oil painting: the man depicted with a powdered wig looks just like his own reflection! The portrait is meant to crown his collection, and he bids for it, but soon the feeling of happiness turns into paranoia, as Pierre-François fears he has gone mad: none of his family or friends see the striking resemblance. However, with the help of the coat of arms, he finds the family of the portrayed man - an ancient noble lineage that has lived at Château Mandragore in Burgundy for centuries. Secretly, Pierre-François travels there and experiences another surprise: everyone seems to know him! They mistake him for the long-lost count, and Pierre-François...