Pittacus Lore authored books in the young adult science fiction series "The Lorien Legacies", including The Power of Six and what prequel?
The Power of Six: The Power of Six is the second book in the young adult science fiction series "The Lorien Legacies", written by Pittacus Lore (James Frey and Jobie Hughes). The Power of Six:  It is the sequel to "I Am Number Four", and was released August 23, 2011 by HarperCollins Publishers. I Am Number Four: I Am Number Four is a young adult science fiction novel by Pittacus Lore (the pseudonym of James Frey and Jobie Hughes) and the first book in the "Lorien Legacies" series.
I Am Number Four