Beginning at a Halloween-themed singles dance for Mormon adults in the tristate area (the party referenced in the title of her novel) a Queen-Bee-costumed Elna Baker sets the scene for the spiritually-infused existential struggles that are soon to come. Although the attendees are adults, the event aches of prepubescent awkwardness and is plagued by the same maladies that afflict these preteen school functions: forced sobriety, abysmal music, sex-segregated clustering, embarrassing encounters with couples dancing, and sanctified social hierarchy.