I seem to be in the middle of a ton of Trilogies (which drives me crazy!). I read I Am Number Four, and then found out it had a sequel named The Power of Six. I first learned about this book because it had a movie made about it, which was a major disappointment after reading the book. I had not read the second book before watching the movie, and I found that part of the reason I didn’t like the film was because they had taken parts from the second book that I didn’t know about yet. The book follows a group of alien kids that escaped their planet’s demise by the hand of another alien race by coming to Earth. They are given a charm that enables them to only be killed in a certain order. The book begins with number three being hunted down, and the story of number four begins. The end of the first book, and the second one show these aliens beginning to find each other and learning more what they are destined to do. By the end of the second book you are aware of almost all of the remaining six Lorean (race of aliens that the nine are).
While it did drag at certain points it was a good read, and I am ready for The Rise of Nine to come out to continue the story.