Pittacus Lore 
I Am Number Four: The Lost Files: Nine”s Legacy 

Number Nine-when John frees him from his cell in the power of six, he”s ferocious, reckless, and ready to fight back. But being held captive changes a person-even a Lorien.
Before meeting John Smith, aka Number Four, before being held prisoner, Nine was hunting down Mogadorians in Chicago with his Cêpan, Sandor. What happened there would change Nine forever. .
Now you can have an exclusive look at what Nine was like before his capture, and read about his dramatic escape from his point of view.