Oliver and Jen are best friends. They play together and help each other. Sometimes they fall out, but never for long. It's nice to be a good friend. This book is in Yellow Book Band, Oxford Level 3, and supports Letters and Sounds Phase 3. Project X Hero Academy Non-fiction is a diverse and inspiring series of fully-decodable titles for reading practice that's matched to phonics knowledge. Aligned to Letters and Sounds, this contemporary series broadens children's subject knowledge, while consolidating their phonics learning and improving their reading fluency.