Classic melodrama scenario: a rich elderly man - his wife is a young beautiful maid. But for private detective Tatyana Ivanova, any plot sooner or later becomes criminal. This is how it turns out in this story - the maid Karina is dead, her husband Vitaly is detained on suspicion of her murder, and his wife Margarita is crying and demanding the release of her husband. With Tatiana's help, the innocence of the infidel is quickly proven, but then events develop in a completely unexpected way. The love triangle turns into a more complex geometric figure - the twenty-year-old son of the main characters turns out to be a fan of the lovely maid. Naturally, now he is the new suspect. And it will be more difficult to prove his innocence...