Kiera Cass has an incredible talent for making readers want to keep reading at the end of every single chapter (this goes for all the books). What I love most about these books is that they never get boring, it's just one thing after another- it's fantastic! As for age appropriateness, I'm going to go with 13 and up due to some references to sex underneath the plot if you know what I mean. For example, America (the main character), when being accepted for the competition, is required to be a virgin, but is then later told that she must submit to any request of the prince, "...even if it's more than kissing." There's also a make-out scene between America and her childhood lover that stops, "just shy of something we could be arrested for." There's definitely a lot of kissing but other than that nothing a parent should be concerned about their 13-year-old reading. There are wonderful messages about family, friends, self-discovery, and many other great influences. These books also portray a very beautiful and sweet example of what true love should be like, which is definitely something teen girls should be reading about. Overall I highly recommend The Selection to girls (and guys I guess) interested in romance, dystopia, and/or monarchy (such as books set in the medieval ages).