Two sisters, Sarah and Gemma, are going through their recently deceased mother's belongings when Sarah thinks she hears a noise downstairs. Gemma investigates but is attacked by an intruder with a knife. Gemma fights off the intruder to allow Sarah time to call for help, but is fatally stabbed in the process. Sarah manages to call 911 but the intruder attacks her as well. Gemma makes a final push to save Sarah, but is killed in the process. Sarah then stabs and kills the intruder just as police arrive.