5 books in series
The Trials of Apollo
The Trials of Apollo is a 8-book series with 5 released primary works first released in 2013 with contributions by Rick Riordan.
| #0.5 |  Percy Jackson and the Singer of Apollo
| 4 | 25 reads | ||
| #1 |  The Hidden Oracle
| 3.91 | 359 reads | ||
| #2 |  The Dark Prophecy
| 3.96 | 235 reads | ||
| #2.5 |  Campo Mezzosangue - Il libro segreto
| 0 | 1 read | ||
| #3 |  The Burning Maze
| 4.24 | 182 reads | ||
| #4 |  The Tyrant's Tomb
| 4.4 | 154 reads | ||
| #4.5 |  Camp Jupiter Classified: A Probatio's Journal
| 4 | 18 reads | ||
| #5 |  The Tower of Nero
| 4.45 | 138 reads |