A shadow hound lurks in River Valley, infecting those bitten with endless nightmares. And the shadow hound is working fast. Liz, Mack, and Cage need to capture this creature before the entire town is infected--but how do you catch a shadow? The Fearless Three put their name to the test on their most dangerous quest yet! As the adventure unfolds, striving readers practice decoding words featuring consonant clusters, as well as inflectional verb endings -ed and -ing. Every Spark Decodables book serves older readers who need practice with foundational literacy skills, combining multiple aspects of the Science of Reading to support small group instruction, independent reading, and reading practice at home.