Knife Edge | Malorie Blackman

No one could begin to guess at the depth of the hatred I held for Sephy Hadley.

Everything began with her and my brother. And that's how it would end. Where there has been love, now there is hate.

Two families have been shattered by the divided and violent society they live in. Sephy Hadley - a Cross, supposedly powerful and privileged - has bound herself forever to her nought lover Callum McGregor's family. But Jude McGregor blames Sephy for all the tragedies his family has suffered.

And he is determined to force her to take sides, and destroy her life . . .

just like she destroyed his. . .