A companion book to the Trials of Apollo series though it can also be linked to the Percy Jackson and Heroes of Olympus series. This book is Percy's take on the camp that is the center of all three of these series though it does mention events that happen in the first two in passing. Percy cracks me up with his comments and helpful insights along the way. This is an interesting addition to the series that offers a few more details than what may be in the books themselves. Definitely worth reading for fans of Riordan's work. I give it 4/5 stars.