A young woman’s attempt to flee from the most religiously conservative community in America, and to take her daughter with her:

The critical battleground in the War Between the Grunwalds would prove to be niddah, or “separation,” i.e., when the menstruating female is considered “impure” and kept apart from her husband. “It isn’t just your period,” Gitty says. After a woman stops bleeding, she has to wear white underwear for seven days, checking constantly to see if there’s any discharge. Should spotting occur, the woman takes her underwear to a special rabbi who examines the color, shape, and density of the stain. It is he who divines when it is safe for the woman to immerse herself in the mikvah (ritual bath) and be reunited with her husband.