Yvette is a link between them.
3 seconds sound clip from the Clue (1985) movie soundboard.
You can hear this line at 01:15:20.358 in the Blu-ray version of the movie.
Quote context
[...]
- We were all in a huddle. Anyone of us could've done that.
- Colonel Mustard has a top-secret Pentagon job.
- Mrs. White's husband was a nuclear physicist, and...
- Yvette is a link between them.
- What's your top-secret job, Colonel?
- I can tell you. He's working on the secret of the next fusion bomb.
- Yes.
- Is this a plot between them, Wadsworth, or did Colonel Mustard do it alone?
[...]