University ice-sailing trainees face a hostel fire when caretaker Krenzel rescues Captain Klaus’s swapped suitcase, barring him from travel due to a stolen Hogarth print inside. X-rays reveal a hidden engraving; detectives Hübner and Lindt expose forger Sander and Krenzel. After Krenzel’s sabotage fails and both are arrested, Klaus is exonerated and rejoins his team for the international regatta.
| Actor | Role |
|---|---|
 Jürgen FrohriepOberleutnant Jürgen Hübner | Oberleutnant Jürgen Hübner |
 Karin UgowskiLeutnant Helga Lindt | Leutnant Helga Lindt |
 Andreas Schmidt-SchallerKlaus Grabowski | Klaus Grabowski |
| FFrank ObermannKurt Löwe | Kurt Löwe |
| SSiegfried WeißNot listed | Not listed |
 Emil KarewiczNot listed | Not listed |
| BBerko AckerNot listed | Not listed |
| DDieter BellmannNot listed | Not listed |
| BBrigitte ScholzNot listed | Not listed |
| DDoris SchmudeNot listed | Not listed |
 Manfred ZetzscheNot listed | Not listed |
 Zdzisław SalaburskiNot listed | Not listed |
 Lothar SchellhornNot listed | Not listed |
 Paul BerndtNot listed | Not listed |
| PPeter KöhnckeNot listed | Not listed |