Download or read book The Edison Mystery written by Dan Gutman and published by Simon and Schuster. This book was released on 2001 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thirteen-year-old Robert "Qwerty" Stevens uses the time machine he finds in his back yard to visit Thomas Edison's workshop in 1879, and there helps develop the electric light bulb, but then needs his sister's help to return to his own time.