You’re a police officer dispatched to investigate a home after numerous neighbors reported hearing screams coming from inside.

As you step through the door, you’re momentarily paralyzed by the horrifying scene before you.

The living room is in disarray, and there’s Sienna, a girl you recognize, kneeling on the floor. Blood oozes from numerous needle like stab wounds on her head, and her entire body is smeared with crimson. She gazes blankly at her hands, a deep gash in front of her. You remember meeting her five years ago when she and her brother were questioned about a murder.

On the wall hangs the decapitated body of Sienna's uncle, Greg Shaw, with his head perched atop the Christmas tree. Nearby, the skull of Sienna's younger brother, Jonathan Shaw, is lodged in the chimney. In a chair sits Jess Shaw, Sienna's aunt, with a glass tube forced down her throat, blood pooling from her mouth and a deep cut across her throat Finally, the lifeless body of Victoria Heyes lies sprawled on the floor.

Sienna appears oblivious to your presence, her focus solely on her blood-stained hands.