The premise is based on something which happened to François Ozon in real life. One of his aunts had prepared a meal for the whole family with mushrooms which she had picked herself in the woods, and everyone got sick during the following night, except her, as she hadn't eaten the mushrooms. Ozon was fascinated by what happened, and suspected his aunt had wanted to poison everyone.
The location shooting took place in Burgundy, in the town of Donzy, near Cosne-sur-Loire, in a rural region rarely shown on screen.
Writer/director François Ozon had already worked with Hélène Vincent, Josiane Balasko and Pierre Lottin in Gracias a Dios (2018), and with Ludivine Sagnier in Swimming Pool (2003).
In a quaint Burgundy village, longtime friends and neighbors Michelle (Hélène Vincent) and Marie-Claude (Josiane Balasko) enjoy a quiet post-retirement lifestyle. Michelle looks forward to spending the summer with her grandson, Lucas (Paul Beaurepaire), but his stay is canceled when Michelle accidentally serves his mother poisonous mushrooms. Initially dejected, Michelle begins to feel less lonely when Marie-Claude's son (Pierre Lottin) returns home from prison.