The story focuses on Ernest Hemingway's 1942 patrols for German U-boats off the cost of Cuba, to get some peace of mind from his failed marriage and do his part for the war effort at the same time. In OTL, Hemingway never found any, and there is actually some suggestion that it was an elaborate stunt on his part. In this story, he does find one, off Cayo Bernardo, and destroys it by throwing a bomb disguised as fire extinguisher down its hatch and ends up lauded as a hero throughout the United States, even though his wife leaves him, saying his immaturity during the whole thing could have endangered their sons, whom he has taken along.