A female psychologist proposes to three couples a group session where they must analyze each other without her being present. She has left them envelopes with instructions on what they have to discuss. The proposed mechanics encourage everyone to express their opinions, argue, and show themselves as they truly are. All of them are prosecutors and defense attorneys. They all interrogate, confess, emotionally reveal themselves, regret what they say, and play at provocation. A film featuring realistic characters filled with humor, until the final twist freezes the smile on viewers faces and everything suddenly takes on a different meaning.