A trois, on y va is a light comical look at the complicated romantic and at times erotic dilemmas that can result when the three are mixed up in such a complex games of musical chair, given the law of Newtonian physics that a person can only be at one place at any particular point in time.
Mélodie (Anaïs Demoustier) is a young criminal lawyer working for another shady lawyer in Lille who knew Charlotte (Sophie Verbeeck), a singer at a local cabaret whose job is rather unstable, first as a former client and then as her lesbian lover, decided on an impulse to visit Charlotte after an absence of 4 years, when she discovered to her surprise that she was then cohabiting with Micha,(Félix Moati), a vet, in their newly bought house. They were having dinner. She was asked to join them on their meal. She hesitated and then agreed. From then on, things started to get a bit complicated. Although she was still madly in love with Charlotte, she was attracted to Micha. The feeling was mutual on Micha's side. So she had to meet both Charlotte and Micha in secret, behind the other's back. As she told them that her boss owed her back remuneration for three months, so that she herself was pressed for rent by her own landlord, Charlotte and Micha both suggested that in the meantime, Mélodie was welcome to stay with them. She at first declined but when they insisted, she changed her mind. In the night, both Charlotte and Micha separately made excuses to leave their bedroom to meet Mélodie and when she met Charlotte to make love with her, perhaps to relieve the tension after making sure that Micha would be late for home, Micha suddenly returned home with some tables and chairs for the house. Charlotte had to make all kinds of excuses to avoid Micha discovering their relationship. That became an occasion for some hilarious slapsticks as a result of some unexpected cat-and-mouse game. There were more such fun when they were attending a party. But it was obvious that Mélodie could not keep up the constant hide-and- seek forever. When the truth dawned on both Charlotte and Micha, they did a ménage à trois which lasts for a couple of idyllic days before just before and after a friend's wedding at a church close to a beautiful but deserted beach, where all three had enormous fun until the morning, when Charlotte decided to leave Micha to Mélodie, saying that those were the happiest days of her life because once Mélodie blundered into their life, some mysterious chemistry had been at work to distance her from Micha.
The film is light comedy on a very difficult subject, expertly done by Anaïs Demoustier who manages to look innocent, confused and credible as the love mad Mélodie. I don't know how many kisses and caresses I saw in this film. But I don't think I would be far wrong if I were to say that they number more than a hundred. It seems the chances of my not being exposed to of some kisses and/or caresses between Mélodie with either Charlotte and/or Micha or between Micha with Charlotte once every 10 minutes or so would be close to zero. I'm quite sure that breathalizer manufactuers would have fought tooth and nail to become the film's sponsor had they known about the number of kisses involved in the takes and re-takes of such oral intimacies.Bonnell added a discreet element of irony in the film because Mélodie was called up in the middle of the night during some hot sex to the police station to secure bail for a repeat sex offender whom she previously defended!