This is the second book in the young adult series which began with Divergent. It is worth mentioning at this point that there is quite a bit of violence in this book - fighting, murder, torture and descriptions of death. I wouldn't think this would be suitable for an early teenager - more along the lines of a 15 or 16 year old. There is, however, no sex just some descriptions of kissing and cuddling. Tris, Tobias and several of their friends and faction colleagues have escaped death and are now looking for somewhere they can be safe and continue the fight against the Erudite and traitor Dauntless. This is a book with several twists and turns. About three quarters of the way through I started to get a little weary of the constant fighting and people changing sides regularly. I was starting to loose track of who was on which side & which faction they belonged to. I did read on through this and the ending was simpler. Unfortunately, I had forseen the final twists where alliegences change again suddenly and had also had a fair idea of the great climax long before it arrived. There are a lot of similarities in this series to the excellent "Hunger Games" trilogy although, in my opinion, it is not quite as good. For this reason I would recommend this series for older teenagers who enjoyed the "Hunger Games". There are a lot of interesting subjects tackled in this book. Tris has to come to terms with killing her friend Will and how that makes her feel. Tris does quite a lot of soul searching and coming to terms with the repercussions of her actions as well as her own guilt. She has to accept responsibility for her actions whether they were right or wrong. She also has to cope with a fledgling new romance with Tobias and the ups and downs of their relationship. These issues, and others raised throughout the book, are issues that youngsters have to face as they grow up - though hopefully not in such extreme circumstances. I did enjoy this book despite getting slightly bogged down for a while. There is a good story in there though perhaps a few less twists and a little more editing would have improved it. It is an excellent stepping stone to adult science fiction.fantasy books.