Noughts and Crosses [With MP3] (Penguin Readers: Level 3)

Sephy Hadley and Callum McGregor are two young people in love. But Sephy is a Cross, daughter of a government minister, and Callum is a Nought. In their world, Crosses and Noughts cannot be friends. Must they become enemies? Or is there hope for them -- and for their unhappy country?