Power of Six is the sequel to I Am Number Four and I think should be adapted into a film. I Am Number Four was a great movie and the books are so good! I Am Number Four made almost triple it's budget even though not many people read the book. Now that so many more people have read the book and it's sequel I think Power of Six would fare better in theaters. Also Power of Six is more critically praised and on Goodreads.com it has better ratings than I Am Number Four. Power of Six introduces new characters and alot more action.