Don't Open the Door tells chilling true-crime tales of unsuspecting individuals whose lives are forever altered when a stranger knocks on the door.

In a world where danger lurks just beyond the threshold, ordinary people are thrust into nightmares when their unexpected guests reveal malevolent motives.

A suburban couple's act of kindness towards a storm-soaked stranger leads to a costly scam. A single mother's trust in a supposed delivery person turns into a hostage situation. A woman's door-to-door evangelism covers up a sinister cult recruitment scheme.