A woman falls trough a sky window in a fancy Bordeaux hotel during a gala. She survives, but suffers from amnesia. The commissioner in charge works on the assumption she was a hired gun, the list of four female names found on her being her targets - a housewife, a surgeon and two employees. While trying to protect them, the police discovers they all have secrets, some of which they rather tell each-other as they become friends. But even more isn't what it seems.