Please take a look at the murder mysteries here.

There is one called "Who Sleighed Santa" that might fit the bill, but with three notes of caution
- It's a "scenario for improvisaiton" - which is to say that there's a narrative arc, a set of events/arguments that need to happen, and character back stories from which the cast improvise the dialogue.
- It's written in British English.  (There may be some minimal adaptation needed to make it work locally.)
- It contains adult themes (though not as blatantly as in some of the other scenarios on that page)