A surprise author is coming to Ms. Gleason's class! It's a real mystery. Ms. Gleason won't say the name of the writer. Some kids think it might be a ghostwriter! The class hires detectives Jigsaw and Mila to solve the case. They are on the trail of the mystery author in this spooky thriller!
Jigsaw puzzles are like mysteries -- you've got to look at all the pieces to solve the case.
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