A hard-working mother hires a male nanny to take care of her son, but soon discovers that he is an antisocial psychopath bent on destroying her family.

Beth Ferrier is happy in her life - fulfilled as a wife and mother, living in a beautiful home in a safe and tranquil neighborhood. Claudia Hartnell lives across the street and seems to be the perfect best friend - kind, compassionate, and a good listener. Nobody would ever guess that behind Claudia's charming facade lies an insatiable desire to live an idealized life. Nobody would suspect that her relentless childhood obsession is about to turn to murderous rage. Claudia wants everything that Beth holds dear and will use any means necessary to take it all away from her best friend.

Divorced father Will and divorced mother Jane start to meet at Denver International Airport when picking up and sending off their children to ex-spouses for holidays and summer vacation. They both long for companionship and love while struggling with the reality of being single parents amid a series of missed opportunities and fears of rejection.