Mysterious incidents are wreaking havoc throughout camp Jupiter. And if the Romans don't find out who-or what-is behind the episodes soon, the twelfth legion could implode. Suspicion falls on Claudia, the fourth cohort's newest~probation. to find out the truth, see through claudia's eyes the crime scenes, and watch as the bizarre events unfold - even when she discovers a secret that holds the key to camp Jupiter's safety.