Prosecutor Katja Schilling is leading a murder trial against the powerful underworld boss Mankoff. But more and more witnesses are withdrawing their incriminating statements in court, because Mankoff's arm still reaches far from prison. All the more important is Nadescha Schaposchnikow, the sister of the young murdered drug courier, who observed Mankoff's crime and is willing to testify as a key witness. Katja keeps them hidden in a secret place until she makes a statement.