Camp Jupiter Classified

A Probatio's Journal

Rick Riordan

Formats & editions

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Mighty Ape

An official companion guide to the bestselling Heroes of Olympus series, set in the incredible world of Percy Jackson!

It's the February after Gaea's defeat. Camp Jupiter, like everyone else, should be celebrating. But something is causing chaos.

Mysterious, sinister incidents are wreaking havoc throughout the camp. Suspicion quickly falls on Claudia, the Fourth Cohort's newest probatio. After all, the mischief started shortly after she stumbled into camp.

To find out the truth, delve into the pages of Claudia's diary. Through her eyewitness accounts, you'll visit the crime scenes (aka the camp grounds) including a row of seats in the coliseum, an underground aqueduct tunnel . . .

And you'll be right alongside Claudia when she discovers an ancient secret that may hold the key to Camp Jupiter's safety.

Return to the World of Percy Jackson in the best-selling, brand-new adventure featuring the original hero in Percy Jackson and the Olympians: Wrath of the Triple Goddess – out now!

Published: 21 April 2026
ISBN: 9780241820100
Imprint: Puffin
Format: Paperback
Pages: 176
RRP: $24.00

Categories:

Children's and YA fiction

About the author

Rick Riordan

Rick Riordan (he/him), dubbed 'storyteller of the gods' by Publishers Weekly, is the author of five #1 New York Times best-selling middle grade series with millions of copies sold throughout the world, including Percy Jackson and the Olympians, now a live-action series on Disney+. Rick is also the publisher of an imprint at Disney-Hyperion, Rick Riordan Presents, dedicated to finding other authors of highly entertaining fiction based on world cultures and mythologies. He lives in Boston, Massachusetts with his wife and two sons. Follow him on Twitter at @RickRiordan.