A woman's body is found in the marshes of Bruges, not far from Bordeaux. The victim was hit in the head, but there is nothing to identify him. Alexandra Ehle had the body repatriated to the forensic institute in order to proceed with its examination. On the autopsy table, the young woman opens her eyes: she is alive.

A couple walks on the Chaban-Delmas bridge, in Bordeaux. He is a renowned neurologist, and his wife is a stay-at-home mother. But the doctor does not seem in his normal state that day. Suddenly, he affirms that he is going to fly away and rushes into the void, under the eyes of his horrified wife. Dementia crisis? suicide? An autopsy is requested to elucidate this mystery.