Maude is 17 years old. At birth, she shows signs that make it impossible to identify her gender. The doctors decide she's a girl. Today, she's preparing for a surgical procedure that will transform her into a young man named Justin.

At birth, every parent expects the famous announcement: “It’s a girl!” or “It’s a boy!”. And if, instead, the doctors declared :”We don’t know“? Through the history of Gabriel, Sophie, Justin and their families, we discover the taboo of intersexuality, formerly called”hermaphrodite”.