The charmed wife
(Book)

Cinderella married the man of her dreams--the perfect ending. Yet now, two children and thirteen and a half years later, things have gone badly wrong and her life is far from perfect. One night she sneaks out of the palace to get help from the Witch who, for a price, offers love potions to disgruntled housewives. But as the old hag flings the last ingredients into the cauldron, Cinderella doesn't ask for a love spell to win back her Prince Charming. Instead, she wants him dead. -- adapted from jacket