Intelligence genius Oleg Stepanovich, a retired colonel, yearns without work, whiling away his days in the park and watching TV... Meanwhile, his grandson Andrei, a novice diplomat, finds himself in a difficult romantic situation. The grandfather flies to his grandson in Yerevan, where he meets his old friend, the cardiologist Irakli, who immediately gets involved in the "heart" business. The operation to solve the love problems of the grandson is called "Grandpa 005", and the methods of the Russian security officer and the Georgian doctor sometimes shock others. But only true love can prevail over the skill of counterintelligence virtuosos.