William’s great surprise, his cousin Clovis, whom he did not see again since around thirty years, arrives from New York to visit him. Reunion between both men creates one thousand memories: always so collusive, they become fast inseparable, living again, the space of moment, their young years… Only Elizabeth, wife of William, who has just lost her father, does not share their cheerfulness.

A private detective, Assoud the Buffalo, feels lonely and is heading for deep depression at the beginning of the Parisian summer. Lucy, a friend, organises a mysterious meeting for him on the banks of the Canal St Martin.