In 1979 Santa Barbara, California, Dorothea Fields is a determined single mother in her mid-50s who is raising her adolescent son, Jamie, at a moment brimming with cultural change and rebellion. Dorothea enlists the help of two younger women – Abbie, a free-spirited punk artist living as a boarder in the Fields' home and Julie, a savvy and provocative teenage neighbour – to help with Jamie's upbringing.

Tim and Lee are married with a young child. The chance to stay at a fancy home in the Hollywood Hills is complicated by Tim's discovery of a bone and a rusty old gun in the yard. Tim is excited by the idea of a mystery, but Lee doesn't want him to dig any further, preferring that he focus on the family taxes, which he promised to do weeks ago. This disagreement sends them on separate and unexpected adventures over the course of a weekend, as Tim and his friends seek clues to the mystery while Lee searches for answers to the bigger questions of marriage and parenthood.