A German scientist drowns while on vacation in Bulgaria. The GDR state security authorities become involved in the investigation, suspecting a political murder.
| Actor | Role |
|---|---|
 Otto MelliesAlbrecht Berger | Albrecht Berger |
 Ruth ReineckeJenny Bachmann | Jenny Bachmann |
| HHanns-Michael SchmidtReik Arnhold | Reik Arnhold |
 Arno WyzniewskiProf. Schill | Prof. Schill |
 Stefan LisewskiDr. Reichert | Dr. Reichert |