I Am Number Four: The Lost Files: The Forgotten Ones

The Forgotten Ones is the thrilling sixth instalment of the Lost Files by Pittacus Lore. Mogadorian-turned-ally of the Garde, Adam, risks his life to help Sam Goode and his father Malcolm escape the Mogadorian base in Dulce, New Mexico. Using the Legacy that Number One bestowed upon him, he sacrifices himself and brings the entire facility crumbling down on his head. Miraculously, Adam survives in one piece, and discovers a secret the Mogadorians have been hiding from the Garde.
Separated from his allies, Adam sets out on a quest to find the one thing the Garde have been missing all these years. The one thing that could turn the tide in this war .