Baby-sitters little sister: Karen’s witch. Ann M. Martin. 2021.

Karen Brewer lives next door to Mrs. Porter, who wears long robes and has wild gray 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! 

Mrs. Porter is getting ready to have a special meeting at her house, and Karen is sure the meeting is for witches. Are they going to cast a spell on Karen? Or will she be brave enough to send them away - once and for all?