Noughts and Crosses (abridged)

Sephy is a Cross, a member of the dark-skinned ruling class. Callum is a Nought, a 'colourless' member of the underclass who were once slaves to the Crosses. The two have been friends since early childhood. But that's as far as it can go. Until the first steps are taken towards more social equality and a limited number of Noughts are allowed into Crosses schools.

Sixteen years have passed since Sephy Hadley first met Callum McGregor. For Callie Rose, growing up mixed race in a world where bitter prejudice divides Noughts and Crosses has meant she's an outsider wherever she turns. Enter Jude McGregor. Jude teaches Callie about her real family history, and the more she learns the more he persuades her where her loyalties really lie. But soon Callie is caught in a trap she can't get out of - one which will have deadly consequences.