La sconosciuta

Irena (Kseniya Rappoport) is a mystery woman obsessed with getting the nanny job with a particular family. She bribes the building's manager to clean the common area. She befriends the family's nanny and then she even trips her down the stairs to her death. Valeria Adacher, her daughter Thea, and husband Donato have a secret safe in their apartment. Thea is pushed around at school and Irena uses unconventional measures to toughen her. In the continuing flashbacks, Irena is an Ukrainian prostitute who finds love with a young man. That past is never far from her mind and comes back to harass her.

This is a movie precious with its ultimate reveal. It does a great job creating some misdirections. It lasts a bit too long. The reveal should come sooner allowing a more compelling action thriller third act. It's a compelling mystery for the first hour. The sex slave montage does get repetitive and possibly reveals too much. This could be a more compelling thriller if it's tighter.