Pola X

A young writer becomes intrigued with a mysterious dark-haired woman who claims to be his long-lost sister, starting an unusual relationship with her and prompting a downward spiral involving his domineering mother and lovely fiancée.

Pola X is a 1999 drama romance movie directed by Leos Carax, starring Catherine Deneuve, Delphine Chuillot, Guillaume Depardieu. It holds an IMDb rating of 5.7/10 from 5,705 votes and runs 2h 14m.