This book contains two interesting stories by the world-famous Vsevolod Nestaik: "Tsypa disappears for the second time" and "Agent of the SD". Two friends, Zhenya and Vitasyk, will once again find themselves in the thick of detective mysteries. Will the boys manage to get out of trouble this time? Will they lack courage and intelligence? Turn the page and immerse yourself in incredible adventures with them. For children of junior and middle school age.