Memory Lost - The Memory Lost Trilogy, #1

What if you based your life on a Lie?In the planet Tatrax in the Dainne system, Cooper Hadley has made it to the top in his underground world. He's the Security Chief of the Tunnel Corps as well as a Patrician, the most privileged class in the Kingdom. But when politics force him to marry, he needs a bride. The perfect candidate is Wye Botero-his one-time best friend. But Wye's a Drone, a member of the lowest class, and she has hated privileged Cooper for ten long, lonely years, ever since he threatened to have her recycled.
Permanently. Wye is hiding a terrible secret about where her loyalties really lie. If she ends up in a fake marriage with the SecChief, what will happen when he finds out who she really works for? As the physical attraction between them grows, the two slowly learn to trust-but will it be too late? After all, the supernova is coming.