#1 of 5 in The Trials of Apollo

#5.2 of 16 in Camp Half-Blood Chronicles

#3 of 3 in The Kane Chronicles

#2 of 3 in The Kane Chronicles

16 Camp Half-Blood Chronicles

16 Camp Half-Blood Chronicles

#5 of 5 in The Heroes of Olympus

#4 of 5 in The Heroes of Olympus

#3 of 5 in The Heroes of Olympus

#7.5 of 16 in Camp Half-Blood Chronicles

#4 of 7 in Percy Jackson and the Olympians

#5 of 7 in Percy Jackson and the Olympians

#2 of 5 in The Heroes of Olympus

#1 of 5 in The Heroes of Olympus

#3.5 of 7 in Percy Jackson and the Olympians

#1 of 3 in The Kane Chronicles