Prénom: Mathieu

A child is the beginning of happiness. A name is the beginning of despair.

Vincent, a wealthy real estate agent, is invited to dinner by his sister Elizabeth and her husband Peter, both professors in Paris. Claude, a childhood friend and trombonist in a symphony orchestra, is also present. Vincent brings news from the prenatal examination of his and his wife Anna's unborn son. The name chosen by the soon-to-be parents strongly offends the others for many reasons. The dispute between the guests quickly escalates and before long the resurgence of old grudges and hidden secrets is unavoidable...