Abby and Zoe are identical twins. When their family moves to a new city, their new teacher starts a competition to see who can tell them apart. Turquoise level titles develop children's understanding of topics with clusters of books on related subjects. High-interest themes such as danger, courage, kindness, bullying and anger are introduced. Each meticulously levelled PM Fiction title features a classic story structure complete with tension, climax and resolution. The stories deal with concepts and experiences that young children can relate to. PM Storybooks cover levels 3-24.