Julien and Esther embark on a passionate affair, irregularly meeting in the blue room of a local hotel.

There, Julien sees Esther, who fills the prescription and also hands over a box of plum jam Delphine regularly receives from the other pharmacy rep, Nicolas' mother.

During the investigation into Delphine's death, police determine Julien made a pit stop on the way home to pick up a FedEx package after obtaining Suzanne's prescription and the box of plum jam.

Eyewitnesses from the FedEx facility claim he spent as long as 10 minutes in a remote area of the parking lot between picking up his package and driving home, and prosecutors argue that during this time Julien secretly poisoned the jam.

The site's critical consensus reads, "The Blue Room proves a sobering study of the dark side of human nature, as well as a coolly assured directorial effort from star and co-writer Mathieu Amalric.