Private detective Tatyana Ivanova enthusiastically begins to keep a diary of the next case under investigation. Hourly and minute by hour, she records in a notebook everything that happens - meetings with suspects, police officers, random witnesses to a mysterious murder. The father of two young girls was killed in his own apartment. Someone hit him on the head with an old cast-iron candelabra, which had stood in the hallway since time immemorial and was inherited by this family from his great-grandmother. There are many suspects, but irrefutable facts and Tatyana’s clear logic sweep them away one by one. And now there is only one left. But did Tatyana follow the wrong trail this time? After all, no one is immune from mistakes, not even the best detective...