Sally Green 
The Bastard Son and the Devil Himself 
Now a major Netflix series

In a world divided between good and evil, what happens when you »re both?
Nathan Byrn is the illegitimate son of the world »s most dangerous witch.
Feared by the Council of Fairborn witches who believe he is destined to follow the same destructive path as his father, Nathan must find a way to unlock his full powers before his seventeenth birthday, or face madness and death.
His one hope lies with the sinister Blood witch Mercury. But Mercury »s help always comes at a price – one Nathan may not be able to pay . . .
Previously published as Half Bad .
 »An action-packed X-rated Harry Potter » – Telegraph