Venice, XVIII century. The city is full of rumors that the famous composer Antonio Viraldini (1705–1741) encrypted the formula for eternal youth in his opera-oratorio “Ruth Jubilant”. Adherents of the ancient cult “Twelve Heads” are trying to take possession of this tempting secret. The struggle for the Sacred Knowledge reaches the present day. Followers of the cult are hunting for a Moscow boy - according to an ancient prophecy, he is the one who is able to unravel the Mystery of Viraldini. Fortunately, two historians come to the rescue - people completely far from music. In this exciting detective-fiction story, different centuries, countries, destinies, mysterious events and human relationships are woven together. And the boy and his adult friends are helped... by Antonio Viraldini himself. For a wide range of readers.