The novel explains the tale of Hank Morgan, a 19th-century resident of Hartford, Connecticut who, after a blow to the head, awakens to find himself inexplicably transported back in time to early medieval England at the time of the legendary King Arthur.
The story begins first person narrative in Warwick Castle, where a man details his recollection of a tale told to by an "interested stranger" who is personified as a knight through his simple language and familiarity with ancient armor.
After a brief tale of Sir Launcelot of Camelot and his role in slaying two giants from the third-person narrative, the man named Hank Morgan enters and, after being given whiskey by the narrator, he is persuaded to reveal more of his story. Described through first-person narrative as a man familiar with the firearms and machinery trade, Hank is a man who had reached the level of superintendent due to his proficiency in firearms manufacturing, with two thousand subordinates. He describes the beginning of his tale by illustrating details of a disagreement with his subordinates, during which he sustained a head injury from a "crusher" to the head caused by a man named "Hercules" using a crowbar.After passing out from the blow, Hank describes waking up underneath an oak tree in a rural area of Camelot where a knight questions him for trespassing upon his land, and after establishing rapport, leads him towards Camelot castle. Upon recognizing that he has time-traveled to the sixth century, Hank realizes that he is the de facto smartest person on Earth, and with his knowledge he should soon be running things.
