Okay, first, to set you mind at ease, a "mucker" is slang for "a coarse vulgar person, esp. one capable of offense against courtesy of honor." I believe it is originally British slang which made its way across the pond in the early 20th century in time for Edgar Rice Burroughs to feel comfortable using it for the title of a pair of pulp fiction yarns collected in this volume. As you would expect from the title, this is the story of a low borne brute, Billy Byrne, who wins the hand of an upper class lady, Barbara Harding . "The Mucker" ran in "All-Story Cavalier" in 1914 with "The Return of the Mucker" being published two years later in "All-Story Weekly." Now both stories are published in a single volume...