In 1963, the Faubourg district in M'lasse was destroyed for the construction of the Radio-Canada tower. A photographer was then hired to immortalize the neighborhood. Halfway between documentary and fiction, Au pied du mur takes up this premise and updates it. The film follows a city employee entering the privacy of the people of a Montreal neighborhood in order to capture one last time what will soon have to be destroyed.

Estelle, 34, wife and mother of the family without history, sinks into a tidy, predictable life. But a series of events puts her identity in question. Worse, she realizes that the crux of the crisis is sexual. She decides to organize a "threesome". Challenge away from his comfort zone. She plunges into this mad quest, resulting with her spouse who feels just as incompetent.