Knife Edge.

A razor-sharp and intensely moving novel, the second in the Noughts & Crosses trilogy.Sephy is a Cross, one of the privileged in a society where the ruling Crosses treat the pale-skinned noughts as inferiors. But her baby daughter has a nought father - Callum. Eaten up with bitterness, Callum's brother Jude, blames Sephy for the terrible losses his family has suffered. Now Jude's life rests on a knife edge. Will Sephy be forced, once again, to take sides?