Private detective Tatyana Ivanova with enthusiasm starts keeping a diary of another case she is investigating. By the minute and hour, she records everything happening in her notebook—meetings with suspects, police officers, and random witnesses of a mysterious murder. In her own apartment, their father is killed—the father of two young girls. Someone struck his head with an old cast-iron candelabrum that had stood in the hallway for ages and had been passed down to this family by the great-grandmother. There are many suspects, but Tatyana’s undeniable facts and clear logic dismiss them one by one. And then only one remains. But was Tatyana really on the wrong trail this time? Because nobody is immune to mistakes—even the best detective…