In a small American town, 16-year-old Lucy is left to largely raise herself, managing the household while her immature mother works and her father is away in Canada for months at a time. As her parents' emotional distance intensifies, Lucy explores her own sexuality with her childhood best friend, Kenny.

Sarah Bolger
as Lucy Diamond

Thomas Mann
as Kenny Crauder

James Marsden
as Chuck Diamond

Claire Danes
as Lainee Diamond

Seth Adkins
as Scott Booker

Jeremy Sisto
as Guy Karlsburg

Anika Noni Rose
as Frances

Jon Tenney
as Bob

Rhys Coiro
as Ron

Will Peltz
as Tim