Invisible Unto the Mirror

Cindy has just moved from High Tech City to Retroville and amazes everyone with her smarts and talent for science. The house she lives in, though, is rumored to be haunted by the ghost of a former student that was even smarter than she was named James Neutron. She hears the tale of his 'demise' but things just don't add up. How could a kid that smart just suddenly disappear?