An epidemic looms. Anne-Marie Leclerc, director of the Emergency Public Health Laboratory, must deal with an outbreak, an overzealous cabinet minister, and a media storm. To top it off, she discovers that her husband has been deceiving her. All this is trivial compared to what’s in store...

The disease continues to spread silently. For now, Anne-Marie has other worries. She sets out to prove to the Minister that her lab is effective. She’s still hesitant to confront Marc. Françoise organizes a celebration for Xavier. It’s a small gathering – with immense consequences.

Anne-Marie combats the misinformation prompting irrational behavior. The minister no longer has faith in her and wants to be directly involved in the experimental treatment. At the lab, Nelli follows up a new lead in the investigation. Will she find the source of the virus?