In a glass grimmly

What really happened when Jack and Jill went up the hill to fetch a pail of water? Well, yes, Jack did break his crown and, yes, Jill did come tumbling after. BUT, they also went on a quest to find a looking glass, which really turned out to be a quest to find themselves. They challenged giants to an eating competition and were captured by goblins. Did they ever find the looking glass? Well, you'll just have to read this book and find out.