But it is of greatest importance.
3 seconds sound clip from the Murders in the Rue Morgue (1932) movie soundboard.
You can hear this line at 00:41:36.778 in the Blu-ray version of the movie.
Quote context
[...]
- I'm leaving Paris tonight. And there is something I have to tell you.
- Oh no, monsieur. My mother has gone to sleep.
- My carriage is downstairs, mademoiselle. We can drive to a café and talk.
- But it is of greatest importance.
- Mademoiselle, you must come. Please. Do me this favor.
- Let me close the door, or I'll call for help.
- But I have a message for you from Erik. He talks only of you. He can't forget you.
- There is something you must know.
[...]