Roald Dahl The Witches: The Graphic Novel by Penelope Bagieu

Witches are real, and they are very, very dangerous. They wear ordinary clothes and have ordinary jobs in ordinary towns and there's nothing they despise more than children. When an eight-year-old boy and his grandmother come face-to-face with the Grand High Witch herself, they may be the only ones who can stop the witches' latest plot!