Series
Persi G'eḳson ṿeha-olimpim
We don't know whether this one is finished.
Nobody has confirmed the status of this series yet. That's a gap in our data, not a verdict on the books.
1 book here
Publication order
This is publication order — nobody has confirmed a different reading order for this one yet.
4
The Battle of the Labyrinth
· Rick Riordan