While Dean continues to research Abaddon—something he soon takes a break from to visit a dive bar, only to be pestered there by Crowley—Sam opts to go investigate a report of the good people of Milton, Illinois spontaneously turning into violent killers. He meets an ex-nun who had encountered the Men of Letters under similar circumstances in 1958. She reveals that Abaddon had been present at her convent and removing people's souls before encountering Henry Winchester (played by Gil McKinney) and Josie Sands (guest star Alaina Huffman) of the Men of Letters. When Abaddon was about to possess Henry, Josie persuaded Abaddon to take her instead. Abaddon left with an oblivious Henry with the intention of studying the Men of Letters from within before destroying them. Now she has demons working for her stealing souls again in order to turn those souls into an army of demons. Sam kills the demon responsible for stealing souls in Milton and releases the captive souls to return to their bodies. Disturbed by Abaddon's plan, he is now as determined as Dean to stop her.