The Power of Six is the follow-up story to I Am Number Four. The story picks up shortly after the last book ended, but it opens with a new member of the Garde (super-cool young aliens with special powers, only six known survivors of their race). If you've not read I Am Number Four, you need to know that in the beginning they were a group of nine. Nine aliens who left their home planet of Lorien when it fell under attack by the evil Mogadorians, who scattered on Earth and went into hiding, who look like ordinary teenagers, but who have extraordinary skills. The Mogadorians killed Number One, Number Two, and Number Three. They tried to kill Number Four, John Smith …and failed. Following a massive battle at the end of I AM NUMBER FOUR that proved that the Mogadorians have found him at last, John joined forces with Number Six. Now the fate of Lorien—and Earth— rests in the hands of these two teens. Already John and Six have inspired a fellow Lorien—Marina, Number Seven—who has been hiding in Spain. She’s been following the news of what’s happening in the US, and she’s certain it’s the sign she’s been waiting for.

I have to admit that it is a hard read at the beginning. You've got a few points of view going on and you have to be able to keep them straight. That being said, it's a pretty good story. It is interesting to see how they use their powers in this book too. The last 100 pages are extremely good with a cliffhanger ending!

This would be a great book for the teenage and adult crowd.