The document details a time travel mission to Normandy on D-Day, June 6, 1944, where the protagonist, Mac, must thwart a shadow organization's plan to alter history. His mission involves linking up with the French resistance to destroy a crucial rail bridge, but he faces unexpected challenges, including a failed jump and the massacre of the resistance cell. Ultimately, the narrative highlights the high stakes of preserving the timeline and Mac's personal struggles in this pivotal historical moment.