“The Lost Relic” is the final book of the adventure trilogy about modern teenagers Anton, Rodik and Tema, the formation of their characters, the formation of moral values, and the choice of life path. Two years have passed since the story told in the story “The Leader and His Friends”, and a year since the events described in the second book, “The Treasure and the Cross”, ended…. At the request of the rector of the Peter the Great Church, Anton, Rodik and Tema undertake the search for an ancient icon that disappeared in the thirties of the last century, which once adorned the Assumption Church in the village of Petrovsky - a miraculous 17th-century copy of the famous Tikhvin Icon of the Mother of God. The guys have no idea what danger they are exposed to. After all, they are not the only ones looking for the icon... The amazing story of the lost relic, the tragic fate of the former rector of the Assumption Church, Father Seraphim, who in a fatal time for the country exchanged his cassock and cross for a tunic and a machine gun, little-known facts from the history of the Great Patriotic War - as the investigation progresses, the guys will see More and more pages of the country's history are opening.