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.

Admitted to Brès Hospital in a health crisis, Nina's father finds himself a patient in the same department he led before handing over the reins to Costa; a man accused of spousal abuse collapses during his arrest.

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

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 once again clashes with Dr. Proust over Ali, a patient who spent his last days in the hospital, far from his mother.