Meg and Mog is a series of children's books written by Helen Nicoll and illustrated by Jan Pieńkowski. First published in the 1970s, the books are about Meg, a witch whose spells always seem to go wrong, her striped cat Mog, and their friend Owl.[1] The first book was published in January 1972. Following the death of Helen Nicholl in 2012, the series was continued by Pieńkowski and David Walser.