With the men of Chicago off fighting WWII on distant shores, Franny Steinberg has watched the women of the city taking charge of the war effort. But amidst the war bond sales and factory shifts, something surprising has emerged. A new marvel that has women flocking to comedy clubs across the nation: the Showstopper. When Franny steps into Chicago's Blue Moon comedy club, she realizes the power of a Showstopper --- that specific magic sparked when an audience laughs so hard, they are momentarily transformed. And while each comedian's Showstopper is different, they all have one thing in common: they only work on women. After a traumatic flashback propels her onstage in a torn bridesmaid dress, Franny discovers her own Showstopper is something new.