"Vengeance is fair" and "The Devil in Paradise" are action-packed novels by the classic of the detective genre Nikolai Leonov from the series about the detective Lev Gurov. An extraordinary and very inconvenient case for the investigation is being "dropped" into the criminal investigation department from the Investigative Committee: the Deputy Minister of Finance was killed at the Deputy Prime Minister's dacha. High-ranking witnesses to the crime are reluctant to cooperate with the investigation, they refuse to testify. Colonel Lev Gurov and his partner Stanislav Kryachko will have to overcome the resistance of the ruling elite and expose the customer of the murder ("Revenge is fair"). In order to block the supply channel of high-class opium from Turkey to Russia, the authorities send Colonel Gurov on work leave. Interspersing a beach vacation with work, an experienced operative, together with an Interpol employee, solves the murder of a young informant, disperses a gang of smugglers who have settled in a fashionable hotel, and disrupts the plans of the drug business ("The Devil in Paradise").