Stranded on a foggy evening, a stranger enters a house to find a man murdered and his wife standing over him with a gun. Her dazed confession seems unconvincing, so the unexpected guest helps her frame a vengeful enemy from the past. Just when it seems this plan has worked, the police discover that the suspected murderer died two years ago. As the secrets and lies of the household unfold, who the real murderer is becomes the biggest mystery of all.