Mister D A Children's Picture Book About Overcoming Doubts and Fears

An inspirational, empowering and entertaining picture book for the whole family about overcoming doubts and fears. Eight year old Julie is getting ready to test for her Black Belt in Martial Arts, but her lack of self-confidence is holding her back - until her Aunt Mary reveals the secret of Mister D. Who is Mister D and what is the secret?