At the funeral of his schoolmate, the nearly-fifty-year old architect Jirí Mánek (Václav Voska) meets his former close acquaintance - physician Jarmila (Blanka Bohdanová). They both are still single. Jarmila has recently returned to Prague after years of work on the frontier. Jirí leaves for a business trip. As a conservationist, he is to grant permission for an adaptation of a Baroque château to office spaces. On the road, a pretty young hitchhiker named Eva (Ida Rapaicová) stops him. Eva is Slovak and her spontaneous behavior enchants Jirí. He thus does not mind making a short detour and takes Eva all the way to the luxurious cottage of her parents. A romance develops between the two people, so different in age and temperament.
Unfortunately the movie Ta třetí is not yet available on Disney Plus.
| Camera | Jiří Kučera | Assistant Camera |
| Writing | Jaroslav Havlíček | Novel |
| Camera | Adolf Hejzlar | Camera Operator |
| Directing | Hana Kozlová | Assistant Director |
| Directing | Aleš Lamr | Assistant Director |
| Costume & Make-Up | Miloslava Skořepová | Costumer |
| Sound | Karel Mareš | Original Music Composer |
| Writing | Jan Otčenášek | Screenplay |
| Writing | Jaroslav Balík | Screenplay |
| Costume & Make-Up | Jan Kropáček | Costume Design |
| Production | Václav Rouha | Production Manager |
| Art | Oldřich Bosák | Production Design |
| Costume & Make-Up | Jan Valkoun | Makeup & Hair |
| Costume & Make-Up | Alena Šedová | Makeup & Hair |
| Crew | Alexandr Kliment | Dramaturgy |
| Costume & Make-Up | Vladimír Černý | Makeup & Hair |
| Directing | Václav Matějka | First Assistant Director |
| Production | Ladislav Novotný | Executive Producer |
| Art | Miloslav Dvořák | Set Decoration |
| Production | Zdeňka Černá | Unit Production Manager |
| Production | Karel Čabrádek | Assistant Production Manager |
| Sound | Roman Hloch | Sound |
| Production | Ladislav Dražan | Unit Production Manager |
| Art | Ivan Ernyei | Set Decoration |
| Editing | Jiřina Lukešová | Editor |
| Writing | Bedřich Kubala | Creative Producer |
| Directing | Jaroslav Balík | Director |
| Camera | Josef Illík | Director of Photography |