Crossed by Ally Condie

Cassia journeys to the Outer Provinces in pursuit of Ky, only to find him gone. Now she must follow the clues he left behind to find him. Cassia's quest leads her to question much of what she believes, even as she finds glimmers of hope for a different life across the border. Nothing is as expected on the edge of Society, where crosses and double crosses make the path more twisted than ever.

The second book in this series is action packed, and just as good as the first!  Cassia, Ky and Xander are on their was to independence fro the Society, but must learn to depend on each other.  I'm reading the third book Reached right now!