Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Spooky and Mysterious Fun

I adore John Bellairs, and this one is my favorite. Take one poor, lonely boy, one giant gothic library, one greedy relative, and one mysterious hidden treasure and mix well for an action packed, fun book. Spooky, but not too scary. Lots of kids will identify with the hero, a lonely boy from the wrong side of the tracks who befriends the librarian at the castle-like library. He discovers a clue to the treasure that was rumored to have been hidden by the library's builder, the mysterious and strange Alpheus Winterborn. Winterborn's greedy nephew is on the trail too, and it makes for a great story.