What will the new Percy Jackson and Olympians book be about?

There isn't a new book in the Percy Jackson and Olympians series planned or confirmed. Rick Riordan has finished the original series, as well as several other related series within the same world (like the Heroes of Olympus and Trials of Apollo).

However, if you're looking for more Percy Jackson:

* Rick Riordan is currently working on the "Percy Jackson and the Olympians" Disney+ series. This adaptation of the original books is expected to be released in 2024 and will likely introduce new storylines and characters.

* The "Percy Jackson and the Olympians" graphic novel series is ongoing, adapting the original books with beautiful illustrations.

* Rick Riordan has several other series in the same universe that you might enjoy, like the "Heroes of Olympus" series and the "Trials of Apollo" series.

So while there isn't a brand-new Percy Jackson book in the works, there are plenty of ways to experience more of his adventures!