Oh, I don't believe it. He must be there. I'm gonna look for him myself.
5 seconds sound clip from the Fiend Without a Face (1958) movie soundboard.
You can hear this line at 00:38:24.420 in the Blu-ray version of the movie.
Quote context
[...]
- Gibbons! Gibbons! Where are you? Gibbons! Gibbons! Gibbons!
- I think you should go home, Mrs. Gibbons.
- No. I'm all right, Doctor. I'll wait here for my boy.
- Don't worry. We'll find him.
- Oh, where is Howard? Where is he?
- Oh, I don't believe it. He must be there. I'm gonna look for him myself.
- You can't go in the woods alone.
- Oh, but I've got to find him. I've got to find my boy!
- You'd better see that she gets home. Get your wife to look after her.
- Have you searched the woods thoroughly?
- We kept calling for him. If Gibbons is out there and still alive, he would've heard us.
- No point in searching any more.
[...]