Azalea, Coen, and Grayson come to find themselves as recruited members of Diterra, an underground organization who protects earth from the Others; invisible beings who spread uncontrollable and uncontainable diseases unknown to mankind. Just when they thought things couldn't get any worse -leaving life as they know it behind- they meet Robin, a girl who grew up in Diterra. Will Azalea, Coen, and Grayson learn to love their new life in Diterra?