Kolmastoista koputus
Movie| Title | Kolmastoista koputus |
| User score | 3 |
| Release date | Apr 1, 1945 |
| Genre | Comedy, Thriller |
| Director | Ilmari Unho |
| Production country | Finland |
| Production companies | Suomi-Filmi |
| Run time | 80 min. |
Two Finnish naval captains face spies in Gothenburg harbor during the second world war.
