After a policewoman from Berlin gave testimony against a powerful clan boss, she is forced to begin a new life with her daughter in Passau, the town on three rivers. The witness protection scheme equips her with a new job, a fictive biography, and a false name. From now on, mother and daughter are known as Frederike and Mia Bader. One Day, Frederike runs into a dubious private detective and has been worried that he might expose her ever since. Mia misses her old life and covertly makes contact. This causes the whereabouts of the little family to become public. With fatal consequences...