Michael Dahl 
Thesaurus Rex [PDF ebook] 

One night, a young student’s thesaurus disappears from her bedroom. A trail of slimy footprints leads to the bedroom window, so she looks outside and sees the thesaurus down below in the grass. Then, suddenly, a colossal monster unfolds itself from the pages of the thesaurus like an origami creation gone terribly wrong. Soon, it towers above the family’s house, constantly changing its form and sprouting a new weapon with each transformation! Who could possibly defeat this shape-shifting monster made of synonyms? This reading experience is complete with non-fiction back matter, including discussion questions, writing prompts, and glossaries, these mysteries are as educational as they are enthralling.