Karen's Witch: A Graphic Novel (Baby-Sitters Little Sister #1)

Karen Brewer lives next door to Mrs. Porter, who wears long black robes and has wild grey hair. Mrs. Porter has a black cat named Midnight and always seems to be working in her garden. Karen isn't supposed to spy on her neighbour, but she's determined to prove that Mrs. Porter is a witch named Morbidda Destiny!