When the three friends hear a strange crash in math class, they strike out to discover the source and happen upon a coded message. Can they crack the code? And if they do, what other mysteries will that lead them to?

This decodable chapter book lets upper elementary readers build fluency with short vowels, consonant blends, and consonant digraphs, while unraveling this page-turning mystery. The series includes accessible, dyslexia-friendly font and takes readers through a systematic sequence of skills.