The murder of a famous artist on the eve of his seventieth birthday shook the whole city. One of the most promising detectives, Dmitry Prozorov, was entrusted with investigating the high-profile crime. So, who could Viktor Grafov, a lonely, elderly man, stop? However, as Captain Prozorov found out, the artist, who grew up in an orphanage, turned out to be not so lonely. He had a brother who had been looking for him all his life, but found him too late. He had a daughter, whom he himself met for the first time on the eve of the anniversary. And, finally, a very strange relationship connected Viktor Ivanovich with the young woman Gelya, who cleaned his workshop. Is it not in the intricacies of these destinies that the mystery of the mysterious murder lies?