6Help TJ and Mark solve the case of the flat hat! This story uses a decodable phonics mystery to encourage confidence in early readers. This book uses a combination of sight words and short-vowel words in repetition to build recognition. Original illustrations help guide readers through the text. Text and format is created by Cecilia Minden, PhD, a literacy consultant and former director of the Language and Literacy program at Harvard Graduate School of Education. Books in this series include author biography, phonetics, and teaching guides.