The Trials of Apollo Book Set

Complete set of The Trials of Apollo series by Rick Riordan. Includes five books with vibrant covers. New, Never used; I bought them for my son who had already read these. First book is soft cover, all other four are hard cover. Includes: Book one: The Hidden Oracle Book two: The Dark Prophecy Book three: The Burning Maze Book four: The Tyrant’s Tomb Boom five: The Tower of Nero