Genesis Alpha by Rune Michaels - Josh and his brother Max are close, closer than most brothers. Not only do they look alike, sound alike, and have the same interests, but Josh was genetically formed in order to save Max's life. An interesting mix of science fiction, murder mystery, and cyberspace, the novel revolves around the murder of a young girl and the suspicion that Max is the murderer. Many revelations have dire implications, not only for Max, but also for Josh.
I enjoyed this book a lot as the issue of Josh being born solely to save Max's life reminded me of My Sister's Keeper. I think this is a great option for guys especially, and won't hesitate to recommend it!