Here it is: The PCs enter a town, they know at least 1 person in town is a kidnapper. I want to have them talk to the residents and discover who it is like a mystery. I don't want my bad guy to blow it because he messed his bluff check when they ask him, "did you do it?" that'd be horrible.
What are some ways to encourage solving the mystery rather than just busting in and beating people?
This will be the first adventure for two 1st level PCs, I don't know what classes they will be or anything else, except I've asked them to be non-evil. It's set just outside of Waterdeep in FR (I don't use much FR flavor because I don't know much, but I'm not against it)
The townspeople thus far are: inn keeper, blacksmith, priest, merchant, town drunk, retired adventurer, hunter.
It's a small town, so I think that could be enough, but any more characters could be useful.
Also, is it too obvious who's doing it based solely on their professions?
Anything you have to say would be useful, and I can give more info if needed, thanks.