Author(s): Sally Rippin
One day Billie and Jack find a note hidden under a rock at school. It seems to be written in code ItOCOs time the two friends put their code-breaking skills to the test."
Sally Rippin is Australia's highest-selling female author and one of the country's best-loved children's authors. Writing for almost 20 years, Sally has written over 50 books for children and young adults, and her mantel holds numerous awards for her writing. Best known for her Billie B Brown and Hey Jack! series, Sally loves to write stories with heart and characters that resonate with children, parents and teachers alike.