This document provides guidance on key conventions for a home invasion horror subgenre. It recommends: 1) Setting the story in a large family home to establish isolation. 2) Using a linear narrative structure for ease of following the plot. 3) Frequent use of low-key lighting to create mystery and focus on characters. It also lists themes of death, madness, bravery and fear. Examples of inspiring films are provided that utilize conventions like hidden antagonist identity, manipulation of characters, and common home invasion plots and locations.