The Tyrant's Tomb
Rick Riordan
The Trials of Apollo (4)
Camp Half-Blood Confidential: Your Real Guide to the Demigod ...
The Letters of J. R. R.Tolkien
J. R. R. Tolkien & Christopher Tolkien & Humphrey Carpenter
The Demigod Files
Percy Jackson and the Olympians (4.5)
The Red Pyramid
The Kane Chronicles (1)