The Devil's Shadow - Sister Witches, #2

The devil made me do it is an understatement for Hennie. Cast out of her coven and deep in the grip of the devil's addictive power, Hennie is struggling to retain the last vestiges of her morality. An ancient anger has awakened inside the body of an innocent girl. Since Hennie's power is useless against the beast, she must recruit her former friend to join the fight. Imbued with a new power source, Rachel and the coven are stronger than ever.
In a rare moment of truce, Paula, Rachel, and Hennie are reunited for one common goal. They must exorcise the trespasser before its evil spreads like a plague over humanity.