Landkrimi S01E28 - Der Schutzengel

Commissioner Paul is puzzled. An older woman's apparent bathing accident could be a perfect murder. Without motif, without traces, without suspects. Or does the deed depend on the disappearance of one young woman together ten years ago? What did the murder victim know that cost her life? Martin, her fiance from back then, is now a police officer and is now investigating in both cases.