An intense new marijuana strain named “Black Forest” is taking Los Angeles by storm, and Gretel’s stoner boyfriend can’t get enough. But when the old woman growing the popular drug turns out to be an evil witch, cooking and eating her wasted patrons for their youth, Gretel and her brother Hansel must save him from a gruesome death — or face the last high of their lives.

A young woman is bound to a chair. Her tormentor is in a gas mask. There's a voice on an intercom. Who are these people and why did they choose her?