Merciless

Gwendolyn Bloom is 17, headstrong and smart. When her father disappears without a trace in Paris, she hears from the CIA that he has been working for them as a spy for years. However, the CIA refuses to help her father. Gwen does not trust them, especially when she finds a coded message from her father. She must save him, at all costs.
Her quest takes her to the underworld of Paris, Berlin and Prague. In this brutal world, Gwen discovers that she must be as ruthless as the men who hunt her.