Sephy is a Cross: dark-skinned and beautiful, she lives a life of privilege and power. Callum is a nought: pale-skinned and poor, he's considered to be less than nothing - a blanker, there to serve Crosses. They've been friends since they were children, and they both know that's as far as it can ever go. Noughts and Crosses are fated to be bitter enemies - love is out of the question. Then - in spite of a world that is fiercely against them - these star-crossed lovers choose each other. But this is love story that will lead both of them into terrible danger . . . and which will have shocking repercussions for generations to come.