unicornia rated My Best Friend Is Invisible: 3 stars
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R. L. Stine: My Best Friend Is Invisible (2007, Scholastic Paperbacks)
My Best Friend Is Invisible by R. L. Stine (Goosebumps)
Sammy Jacobs is into ghosts and science fiction. Not exactly the smartest hobby--at least not if you ask Sammy's parents. …