2.5 stars 
 I remember really enjoying the movie when it came out about 5 years ago. I also remember feeling kind of disappointed when I realized there wasn't going to be a The Power of Six movie. I'm not sure if I can say the same about the book series though... 
 I'm sure I would've really enjoyed I am Number Four back when I was 14 or 15 because it's written in such a simple and direct form. But reading it now, I felt that Number Four is kind of childish and the narrative (despite being written in the first person) felt very distant and dispassionate. I'm just not too fond of the writing style. I do, however, enjoy the story line. 
 If you're into aliens, superpowers and plenty of action, then you're going to enjoy the story line of this series 
 Basically, there are nine kids (plus their guardians) that escaped to earth after their home planet was destroyed by the evil Mogadorians. Under a special protection charm, these kids can only be killed in the order of their numbers. They're pretty much invincible if you try to kill them out of order. 
 In I am Number Four, numbers One, Two, and Three are dead which means (if you know how to count) Number Four is next. Thankfully, Number Four (aka John Smith) is growing into his Legacies (alien puberty) where he's starting to develop superpowers that will let him fight back when the Mogadorians come for him.