After taking a wrong turn while hallucinating from poisonous mushrooms, Maisie stumbles into Hell and mistakes Lucifer for her cousin Michael. Lucifer, convinced she is the cousin who abandoned him at the altar a century ago, drags her into his war with Heaven. As Maisie's cheerful chaos softens Hell and exposes a forgotten past, mistaken identity turns into real devotion—and the road she got wrong leads her to the right husband.
