What Became of the Mulvaneys tells the story of an American family, the Mulvaneys, consisting of a hardworking and successful father, a charming mother, three wonderful sons, and a beautiful daughter.

They live on an idyllic farm called High Point Farm, enjoying a comfortable and secure position within their community.

But something happens to their precious daughter Marianne—an incident never spoken of in the Mulvaney household—that sets the collapse of their world into motion.

Years later, the youngest son, Judd, recounts the family’s story, reflecting on their brightest moments, the dark scenes, and the secrets that ultimately tore them apart.