Harriet Muncaster is an award-winning author and illustrator. Her Isadora Moon books have sold over two million copies worldwide. And in 2020, Muncaster also published Bad and Glittering, the first part of her middle-grade series Victoria Stitch. And now she's here with the latest Victoria Stitch book Dark & Sparkling. Harriet reveals how she develops her incredible characters, shares how she divides her time between writing and illustration, and how she was driven to create her own worlds. And the two Marks discuss the importance of being childlike and end up being very childish and losing their marbles...