Based on the Meg Wolitzer's novel about a group of friends who meet at an arts camp when they're 15 in 1974. The series chronicles their relationships throughout the next three decades dealing with the great expectations of youth juxtaposed with the realities life hands you as you get older.

Single mother Chloe has her life turned upside down when her younger sister, Sadie, comes home after a long, unexplained absence. Though Sadie seems to want to settle in with her sister and 17-year-old niece, it soon becomes apparent that she may have sinister intentions.