This film is detailed and occasionally harsh, but told by a master storyteller. the director has modified the John LeCarre novel somewhat, but weaves a strong story. It's a little hard to follow if you don't know much about the world of Israeli/Palestinian conflict, but provides quite an education by its end.
It begins with the assassination (bombing) of an Israeli diplomat and family and then jumps to an American stage actress, Charlie (Diane Keaton), who's currently living in Britain. She is ideologically a supporter of the Palestinian cause. She has a problem with falling in love easily and sympathizing with her lover. You begin to see the wheels turning in Israeli intelligence as they research and try to react to this most recent terrorist bombing.
They skillfully recruit/seduce her by pretending to support the Palestinian movement. To be effective in their scheme, they need someone authentic. They try to get under her skin and into her personal psyche (why she is an actress, pain in her life). Klaus Kinski is superb as the head of the Israeli intelligence effort.
After feeling more confident, they put her work to infiltrate the Palestinian-backed terrorist camps to ultimately get to the almost impossible to find bomber Khalil. This involves serious physical/military training. She excels and is given more and more trusted tasks as the story progresses. The story takes many twists and is very detailed and realistic in it's portrayal of both sides. It gets a little heavy, but is fascinating to watch unfold even a second time.
I give it a solid recommendation.