Girl kept against her will

I don’t remember the beginning. I believe a little girl is kept against her will and confined to a house. The man that is keeping her in the house is not only mean but a murderer. When the little girl wakes up one night to find him killing someone, she tries to inform his wife. The man’s wife finds evidence of the murder and runs into a bedroom crying. The man goes to shoot her. The little girl, remembering that the man kept a gun in the closet, shoots him before he can shoot his wife.

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