In the middle of the 17th century, the Marquise de Sévigné wanted to make her daughter a brilliant and independent woman in her own image. But the more she tries to control the young woman's destiny, the more she alienates her. Mother and daughter then experience the throes of a singular and devastating passion. A major work of French literature is born from this devastation.

Summertime. While a pandemic spreads overall, Paul, his wife Hélène and his little sister Lisa, isolate themselves in their countryside house. There, they meet old friends : Bruno and his sister Mélanie… Some of them love each other but say it wrongly ; some of them don’t even dare to say it ; some of them hate each other… What will strike them first? Disease or despair?