During a mission, a young policewoman kills a supposed attacker. Her colleague relieves her by making it look like self-defense. Traumatized and reluctant, Sarah Korr is sent off to forget the incident. As she sets out on a journey, Sarah experiences how the father of a small boy is shot dead at the airport. Instinctively, she rescues the shocked child, pulling her into the next train. She hides Lino with her grandfather in a lonely alpine hut. But a killer is on her track. And Sarah realizes she's got into trouble with a criminal organization.