When Laura finds her homework in her locker with its writing reversed, she's baffled, until she learns an unbelievable secret: her weird neighbor, Omar, has the ability to travel to the fourth dimension. Laura forces him to take her there and then, a novice in four-space, she goes there on her own. There's only one problem, she doesn't know how to get back. A cerebral science-fiction thriller, cunningly constructed to keep the reader involved until the last pages. -The Horn Book
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