Syriak, Justin and David meet by chance in front of a map of Paris at Austerlitz station. Justin is released from prison. David is hospitalized in Paris and Syriak has been expelled by his wife. They have a priori nothing in common except a deep distress on the human level and three identical suitcases ...David's discomfort and inadvertently exchanged suitcases will be the cornerstones of their story. Indeed, for David, Paris looks like a human brain, and Montmartre is at the exact location of his brain tumor.If integrity is a virtue of the human soul and if it lodges in the brain, and if it is in the shape of Paris, what could be more natural than a crossing of Paris to discover and enrich oneself? On personal plans ?