Firmin has weird obsessions. If his strange behavior doesn’t worry his colleagues on site, it’s because they are already overwhelmed by organizational problems and a certain incompetence. "A construction site we know when it starts but we never know when it finishes", says the saying, and the turn of events makes fear the worst to Brunet, small leader of this site that seems to be undone day after day. While waiting anxiously for a delivery of Zyrtec Bleu pigment, metaphysical events occur, tilting this closed-door into an absurd and inevitable chaos.