Book excerpt: Silent Echoes: Discovering Early Hollywood Through the Films of Buster Keaton is an epic look at a genius at work and at a Hollywood that no longer exists. Painstakingly researching the locations used in Buster Keaton's classic silent films, author John Bengtson combines images from Keaton's movies with archival photographs, historic maps, and scores of dramatic "then" and "now" photos. In the process, Bengtson reveals dozens of locations that lay undiscovered for nearly 80 years. Part time machine, part detective story, Silent Echoes presents a fresh look at the matchless Keaton at work, as well as a captivating glimpse of Hollywood's most romantic era. More than a book for film, comedy, or history buffs, Silent Echoes appeals to anyone fascinated with solving puzzles or witnessing the awesome passage of time.