Die Toten von Marnow S02E01 - Finsteres Herz

Chief inspectors Frank Elling and Lona Mendt are critically injured during a witness protection mission. The witness, twelve-year-old Sarah, manages to escape the brutal attack but has disappeared. Special investigators Hagen Dudek and Maya Kaminski take over the investigation and are faced with a difficult case. All files and records relating to Lona's and Elling's previous mission have been inexplicably deleted. What happened?