The unexpected death of the banker's widow did not surprise anyone. Her older sister suspected murder and hired detectives. The head of a private agency and his young colleague got down to business. The widow's son-in-law, nephew and granddaughter's boyfriend came under suspicion. A strong motive for the murder is the illegitimate daughter of a banker, but judging by the nature of the crime, it was committed by a man. As the investigation progresses, piquant details from the life of the murdered woman become known, but this leads nowhere. Another murder completely confuses the matter. Maybe the concept of Nietzsche’s “Eternal Return” will help the detectives? Why not? The main thing is to identify significant associative connections.