Private detective Tatyana Ivanova is investigating a case of theft of a fairly large sum from a personal bank account. The owner of a chain of dental clinics suffered, which means that troubles should be expected primarily from competitors. However, Tatyana is not going to exclude either the businesswoman herself or her ex-husband from the list of suspects - people, as we know, are capable of degeneration when large sums are at stake. The case of the false tooth will only confirm this rule: new troubles will fall on Tatyana and her client from a direction from which no one was expecting them...