Baron Brusenhielm at castle Tröstehult in Skåne dislikes how his young son Karl Oscar is playing “mother and father” with the tenant’s daughter Ann-Marie, as he anticipates the beginning of a future misalliance. Years pass, and Karl Oscar is about to graduate high school. He pretends to study church history but reads in fact “The Seducer’s Diary” and thinks of Ann-Marie, who is now grown up into a woman.
| Actor | Role |
|---|---|
 Nils EkstamKarl Oscar | Karl Oscar |
 Edvard PerssonTobias Bruce, tutor | Tobias Bruce, tutor |
 Ellen DallAnn-Marie | Ann-Marie |
| NNils CarlbergGunnar Storm | Gunnar Storm |
| VVictor HallinJan | Jan |
| AAlgot LarssonJacob Blide | Jacob Blide |
| GGöta LarssonBritta | Britta |
| RRichard SvanströmBaron Brusenhielm | Baron Brusenhielm |
| WWera Berg von LindeMärta | Märta |
| HHarry PerssonKarl Oscar (Child) | Karl Oscar (Child) |
| OOlleh PerssonKarl Erik | Karl Erik |
 Johan RosénPer | Per |
 Olga HellquistStina | Stina |
| EEllen RosengrenGovernor | Governor |
| EErnst MalmquistServant | Servant |