The mystery story here was half decent, as so many of the new ones are, but that really wasn't the point.
What was the point was two assistants bickering, which I found quite amusing. It was interesting to see the comparatively feeble Natalie standing her ground about monk in comparison to the aggressive, grating Sharona. The scene in which they fight over taking the stairs ("Mr. Monk likes the stairs") versus the elevator ("Adrian needs to be pushed") only to be resolved by Monk - "We're taking the elevator to eighteen and walking back down nine flights, that way everyone is miserable" - was perhaps the highlight of the show.
Also nice to see Randy get some action - finally! - though it seems odd that he'd want it. The real mystery is why everyone kept telling Sharona how great she looked when she'd clearly gained 30 pounds.