Flynn's next target is the assassination of Lincoln, and the terrorist plans to make sure that not only Lincoln but the Union's other top officials die. Lucy, Wyatt, and Rufus try to stop him but wonder if history might be better served if they save Lincoln as well. Meanwhile, Lucy tries to deal with the repercussions of her life in the new timeline.

The team heads back to 1944 to stop Flynn from giving his recently-acquired nuclear bomb to the Nazis. However, they soon wonder if he's up to something much more complicated. Meanwhile, Rufus considers his loyalties, and Wyatt gives Lucy advice on dealing with her anxieties in the field.