All I can tell you is that the doors and windows were barred on the inside. So no one on the outside could have gotten into this house during the night.
10 seconds sound clip from the Revenge of the Zombies (1943) movie soundboard.
You can hear this line at 00:29:46.848 in the DVD version of the movie.
Quote context
[...]
- Unless you, Scott, insist on calling in the police.
- I will if we don't find out what's become of her.
- I ain't seen nothing and I ain't heard nothing.
- Nothing.
- You sure you don't know where she is, Master? You sure you can't guess?
- Would I be asking you if I knew?
- Well, you might, Master, if you wanted to pretend you didn't know.
- Lazarus, go out and search the grounds.
- Kind of creepy. When the dead walks of its own will, no telling what they'll do next.
- Go out and gather me some swamp lilies. Bring them to my laboratory at once.
[...]