Final book in the Rule of Three trilogy. While this series is aimed at young adults I enjoyed the whole concept of how fast a community can deteriorate after a viral catastrophe renders all computers and things with computer chips worthless and inoperable and how hard choices can help communities survive. This third book wraps up fairly nicely the threat of one of their own betraying the community and his attempts to wreak havoc on all surrounding families. The addition of other larger communities that are just as prepared and organized as the main characters' walled in community gives the author a chance to start showing how the people are moving forward and how humanity in this small area of the country are determined to strive and succeed. Adam, the 16 year old "hero" of the books is a bit of a reach as far as maturity and leadership skills are concerned but seeing how this is a young adult series it works well. Fr a quick, fun read I'd suggest getting all three books at once because it won't take long to breeze right thru them as the story line is pretty well thought out and just intriguing enough to make you want to keep reading. Enjoy