This second book in the Matched trilogy is better than the first. The first book takes place entirely within the very structured, controlled world of The Society, so nothing exciting happens. While it makes for an interesting set-up to the story, it doesn't make for a very exciting story. In this second book, Cassia and Ky find themselves on the outskirts of Society life, and they even venture out into the caves and canyons outside. So there's more action, and some unexpected things happen, to show that hey, when you venture outside The Society's rules, you just never know what's gonna happen. But it's still pretty slow-moving. Cassia pines for Ky, and Ky thinks a lot about Cassia, and how much of his story he should let her know. And that's another problem with the book - secrets, and hints at secrets, and references to secrets that may be the reader knows about, but do we I don't know and it's all so confusing. We need a synopsis at the end of the book to say, here's all the stuff we definitely told you definitely happened in this chapter.
The point of view alternates back and forth from chapter to chapter between Ky and Cassia, something I often find annoying, but don't mind in this case. James Patterson does this a lot, but he'll have one character carry the point of view for several chapters, then switch to another, and so on. Condie only switches back and forth between Cassia and Ky, and they alternate from chapter to chapter, so you know that, if Cassia was telling last chapter, Ky is telling this one. Makes things a lot less confusing.