He's threatened to murder Dr. Kemp at 10:00.
3 seconds sound clip from the The Invisible Man (1933) movie soundboard.
You can hear this line at 00:58:32.101 in the Blu-ray version of the movie.
Quote context
[...]
- I'll tell you after we've made certain he's not in this room.
- Good. Now we're safe here at last.
- Constable, keep an eye on that window.
- Now come here, all of you, and sit down.
- Now listen carefully. We've got a chance tonight that will never come again.
- He's threatened to murder Dr. Kemp at 10:00.
- And from what we know of him, he'll do his utmost to carry that out.
- He's certain to be near this house, watching for some time beforehand.
- It's a natural thing for Dr. Kemp to seek protection.
[...]