When Marius decides to find his father, his mother sees only one solution: hire someone to play this role and finds in Robert Pique the ideal candidate. He must pretend to be his father and disappoint Marius so that he stops his research. Unfortunately, not everything will go as planned.
Marius Vallois is twelve and needs a father. Marie Vallois has a twelve-year-old son, huge professional responsibilities, a demanding lover, a job vacancy to fill, a beloved sister, a complicated cousin but no father for Marius. Robert Pique has a steam iron, a pile of ironing to do, a Chinese fantasy and a neighbour whom he protects while looking for work. Monsieur Papa is the story of the strange bond that will be formed between these three characters. A bond that will give them plenty of headaches and mark their lives.