Chief Inspector Johannes Fischer (Henry Hübchen) is now retired. The last case he investigated together with his former boss Konstanze Satorius (Victoria Trauttmansdorff) has been closed, but Fischer is still convinced that an innocent woman is in custody. Liane Sievers (Kim Riedle) was convicted of manslaughter on the basis of circumstantial evidence. When the murder weapon from the old case is accidentally found in a burglar’s warehouse, Satorius persuades her former colleague to reopen the case together. Because fingerprints were found on the murder weapon – but not those of the convicted Liane Sievers.