Knock Knock

The latest attack in a string of violent home invasions kills senior Elsie Englehart. Security officer Casey Holland is devastated. She is supposed to be watching over elderly bus riders in an affluent, high-risk area, but she's let Elsie down.

Determined to keep others safe, Casey escorts an elderly man home, but an armed intruder attacks them both. Hospitalized and angry, Casey struggles to regain control of her life, despite interference from family and colleagues-and the postponement of ...