On a warm summer morning in North Carthage, Missouri, it is Nick and Amy Dunnes fifth wedding anniversary. Presents are being wrapped and reservations are being made when Nick's clever and beautiful wife disappears from their rented McMansion on the Mississippi River. Husband-of-the-Year Nick isn't doing himself any favors with cringe-worthy daydreams about the slope and shape of his wife's head, but passages from Amy's diary reveal the alpha-girl...

"After fifty years of marriage, Stan and Joy Delaney are ready to start what should be the golden years of their lives. One night a stranger named Savannah knocks on Stan and Joy's door. She says she chose their house because it looked the friendliest. And since Savannah is bleeding after a fight with her boyfriend, the Delaneys are more than happy to give her the small kindness she sorely needs. If only that was all she wanted. Later, everyone will...