The fourth title in Rick Riordan's Trials of Apollo series - set in the funny, mythical and action-packed world of Percy Jackson. The former God Apollo is having a pretty rough time of it. Well, for one thing, he's called Lester. But being an awkward mortal teenager is the least of his worries... 9+ He was a God once. Until he was cast out his father, Zeus. Now, he's an awkward teenager.