On her first day as a trainee nurse, Nina questions the diagnosis of the head of the internal medicine service, who is none other than her ex-husband.

Nina saves a surgeon whom she caught having sex with a 20-year-old nurse apprentice, but everyone believes the story to be quite different.

Nina is torn from her sleep on a day off by a phone call from her father's housekeeper: he felt unwell and was rushed to Madeleine Bres hospital.

Nina becomes attached to Louise, a young obese patient whom Proust casually treats, convinced that all her problems are due to her weight problems.

While her department is overwhelmed by a flu epidemic, Nina finds Caroline, her best friend from high school, who has come to consult for her son.

Nina clashes once again with Dr. Proust over the case of Ali, a patient who came to end his days in the hospital, far from his mother.