It's the February after Gaea's defeat, and mysterious incidents are wreaking havoc throughout Camp Jupiter.
If the Romans don't figure out who--or what--is behind the episodes soon, the Twelfth Legion could implode.
Suspicion falls on Claudia, the Fourth Cohort's newest probatio .
After all, the mischief started shortly after she stumbled into camp.
Plus, she's a daughter of Mercury, the god of thieves and tricksters.
To find out whether she's guilty or innocent, readers can delve into .
Disney-hyperion The trials of apollo camp jupiter classified: an official rick riordan companion book: a probatio's journal, hardcover/rick riordan
