There were thirteen of them, thirteen prominent Venetian nobles and political figures who, in the 16th century, organized a conspiracy to change the system of power. It was from them that the famous painter Jacopo Tintoretto painted the painting “The Last Supper”. But the secret conspiracy was discovered, the Doge of Venice was killed by one of his former comrades, and the city’s main jewel disappeared without a trace... In the Hermitage, in front of a portrait of Admiral Morosini by Tintoretto, an unknown person was murdered, and the picture itself changed in an unimaginable way: blood appeared on the rod in the admiral’s hand . Expert and restorer Dmitry Starygin examined the canvas in every possible way and found that the paint used to paint the blood was genuine, ancient, like, in fact, the whole picture. But there was no mysterious inscription before. Having arrived in Venice with the portrait of the admiral, Starygin accidentally discovered the same inscription on another work by Tintoretto and realized that life had once again given him a mystery that he simply had to figure out...