In 1940, Fisher moved to Hagerman, Idaho with his third wife. There he started his "Testament of Man" series, an epic series spanning twelve volumes and tracing the development of the human race from prehistoric times, culminating in another autobiographical work, "Orphans of Gethsemane". He read over 2,000 scholarly books in his research on the history and development of the human race for the Testament of Man series. Writing the 12 unsuccessful books took 20 years, and readers disliked the long, rambling digressions. Vanguard Press published volumes one through five; Abelard published the sixth and seven, and Alan Swallow published volumes eight through twelve. J. H. Gipson, a publisher at Caxton Printers, published "In Tragic Life", which was somewhat successful. Caxton printers had published "The Idaho Guide", and Gipson and Fisher were friends until Gipson refused to print "Jesus Came Again: A Parable", the eighth novel of the twelve-volume epic. Alan Swallow offered to publish the remaining volumes, focusing on special signed and numbered editions to help offset printing costs. All twelve novels in the series have been out of print for decades.