In the last film of the original 91 film series two letters - one written in spite and another in love - end up in the wrong hands, while 91 and 87 as usual try to avoid ending up in military arrest.
| Directing | Åke Grönberg | Director |
| Production | Jack S. Kotschack | Producer |
| Sound | Jules Sylvain | Music |
| Crew | Bengt Lindström | Cinematography |
| Sound | Nils Grening | Sound |
| Costume & Make-Up | Sture Höglund | Makeup Artist |
| Writing | Per Lennart Ekström | Writer |