Making a terrible discovery at the stream about a mysterious threat that is endangering its magical creatures, Zoey and Sassafras race against time to discover the source of the problem and save the Merhorse species. Grades K-5.590LDecoding demand: 77 (high)Semantic demand: 96 (very high)Syntactic demand: 86 (very high)Structure demand: 87 (very high)

1. Imaginary creatures -- Juvenile Fiction.; 2. Experiments -- Juvenile Fiction.; 3. Cats -- Juvenile Fiction.; 4. Animals, Mythical -- Juvenile Fiction.; 5. Ecology -- Juvenile Fiction.; 6. Science -- Experiments -- Juvenile Fiction.; 7. Fantasy fiction.;