The Tyrant's Tomb (The Trials of Apollo Book 4)

In 'The Tyrant's Tomb', Apollo—now a human teenager named Lester—continues his harrowing journey as a mortal. Accompanied by demigod friends and faced with devastating losses, Apollo must reach the ancient Roman Camp Jupiter, where an undead emperor plans to control or destroy all that stands in his path. With the help of new alliances and the power of friendship, Apollo fights to prevent the prophecy of the tyrant's tomb from coming to pass, while learning more about his own powers and the true meaning of bravery and sacrifice.