After a tragedy reunites Nicole with her childhood friends, they each find themselves in danger, targets of a deranged stalker. Nicole knows this can't be a coincidence. The secrets of their past are coming back to haunt them.

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.