Ever since they visited a flat to move in together, Arnaud has had a slight doubt:
Does Marion have a crush on the estate agent? By pure chance, he meets the agent's double and asks him to pretend to be the real estate agent. A brilliant idea! Unless the fake estate agent comes face to face with the real one...
And a twin brother turns up unexpectedly. Three look-alikes in one evening is too much for Arnaud!