you moved in with your friend sarah after her husband, Robert died in a horrible way. A young officer investigated the case but no culprit.

you see sarah always talking alone in dark. she speaks with someone but you never saw it.

One day you heard a noise you went & saw sarah sleeping in her room but beside her a dark figure inhumane staring at Sarah. You turn on lights, its gone. Turn off, its there but now staring at you. you turn on the lights again, it is gone

You decided to investigate to save her or atleast yourself before its too late.