Callum is a nought - a second-class citizen in a world run by the ruling Crosses...

Sephy is a Cross, daughter of one of the most powerful men in the country...

In their world, noughts and Crosses simply don't mix. And as hostility turns to violence, can Callum and Sephy possibly find a way to be together? They are determined to try.

And then the bomb explodes...

A gripping, stimulating and totally absorbing novel set in a world where black and white are right and wrong.