

She learns that Thea has an "illness" where she does not guard herself when falling. While her parents are away Irena teaches Thea how to defend herself by tying her up and pushing her onto a bed of pillows, then onto the bare wood floors. This actually brings them closer together after Thea gets over the anger of being pushed down over and over.

Irena's pimp, whom she believe she had killed, wanted her to know he knew where she was and had her savagely beaten. After not showing up to work for weeks, she returns and almost loses Thea. After this Thea's mother fires her, growing suspicious of Irena. Irena's pimp shows up in her apartment, and threatens her to return the money she stole from him. The next day Thea's mother turns up dead.
To Irena's delight Thea's father asks Irena if she could take care of Thea full time, but soon after Irena is questioned by the cops. She reveals her whole story. Irena had gone through a dozen pregnancies and abortions while she was a prostitute. The last child she had was from her lover who was killed by her pimp, and this child was the last one she had before the child told her she would be unable to become pregnant again. After begging to find out the name of who adopted her child, her pimp just made up a last name. The fact that Thea was adopted and around the same age was just a coincidence, she was not her daughter. Irena went to jail, but after she got out Thea was there to meet her.
The Unknown Woman was about Irena's struggle to become free and obtain all she ever wanted, which was the child she bore with her late lover. However, like the everything else in Irenas life, it was taken away from her and never returned. She was striving to get back the piece of her life that made her happy. It wasn't Thea. Irena had a dozen children she could try and locate, but she chose the daughter of her lover so she could have a part of him back.
The movie had plenty of twists and turns that weren't easy to predict, which is something you can't say about most modern movies. It was paced well, and you could feel Irenas urgency in every scene. You could sense her imbalance, and unfamiliarity with the world outside the jail that had been her bedroom.