When a vengeful, mentally-ill stepsister blackmails three successful women, they commit a horrific act to protect the secret of how they gained their fame and fortunes.

When Autumn, a bestselling novelist, sends her mentally-unstable stepsister away on a "5150" involuntary mental-health hold, her best friends rally around her. Two years, later her stepsister resurfaces with secrets to share about all of them and the line of sanity and insanity gets blurred.