Detective Dime Novels featured the adventures of Dr. Thaddeus Harker, a sawbones with a penchant for crime. The first issue was dated April 1940. Doc Harker was an old-fashioned Southern gentleman, a retired chemist who now devotes his life to criminology. He travels around in a rundown medicine show with his two aides "Herk" Jones and Brenda Sloan. With this as his cover, he delivers his own brand of justice when crime sprouts.