I ave an idea for a short story, this guy goes past this house on his walk to work every day, for like a year and he builds loads of ideas about it in his head. Then one day he goes in, head full nof curiousilty, and then basically it becomes a psychological horror with him searching the house and then being convinced someone or something is after him inside the house, the rest of the story is him trying to escape alive.

Its meant to be really ambiguous as to whether it as his mind playing tricks on him or if there was something really there.

I miht put a twist so that when he gets home he goes crazy tver the days and weeks proceeding the event as he is convinced the "thing" is still after him before he kills himself with fear". The final pat after he leaves the mansion would be epistolary (sp?) ie, entries in his diary.

PS Im sober so I dont know if this counts.

EDIT: its set at the turn of the century.