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Marcel goes to visit Celine one of his friends who paints pictures but before leaving he realizes that "the new guard" is stealing the painting of "The Mona Lisa" and is keeping it in a black bag so he runs along the wall very fast, climb up the tall black bag and jump inside.

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The 'guard' of the Louvre gets on a train and sits next to a thin man with sunglasses and a white jacket, who asks him if he accomplished his mission and he answers yes.

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Antoine and Henri read a newspaper story that says "THIEVES TAKE DA VINCI'S PAINTING", but that doesn't really worry them.

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Marcel comes out of the black bag but goes into despair because several cats see him and try to chase him. However, his biggest concern was the "Mona Lisa" so he leaves it in a safe place, he realizes that there is a police station and the front door has a mailbox

# data[].attributes.body
Two days later, Marcel is back in Paris. At the station he sees a newspaper that says 'ITALIAN POLICE FINDS MONA LISA', then he goes to the Louvre and tells Celine everything.