The Trials of Apollo North America to restore the remaining four Oracles and defeat the triumvirate of Roman emperors-turned-Gods, while also being helped by Leo Valdez, the now-mortal Calypso and Festus the bronze dragon. "The Burning Maze" is the third book in the series. It released on May 1, 2018. The book follows Lester Papadopoulos/Apollo, Meg McCaffrey and Grover Underwood while they try to rescue Herophile, an Oracle that speaks only in puzzles, from the Roman emperor Caligula and his talking horse, Incitatus. In the process, they met some strixes that feed only on blood, which they finally repel using strawberries. While sleeping, Apollo
Louis IV, Holy Roman Emperor in 1323, Louis had sent an army to Italy to protect Milan against the Kingdom of Naples, which was together with France the strongest ally of the papacy. But now the Lord of Milan Galeazzo I Visconti was deposed since he was suspected of conspiring with the pope. In January 1328, Louis entered Rome and had himself crowned emperor by the aged senator Sciarra Colonna, called "captain of the Roman people". Three months later, Louis published a decree declaring Pope John XXII ("Jacques Duèze") deposed on grounds of heresy. He then installed a Spiritual Franciscan, Pietro Rainalducci as Nicholas V,