Wrongdoings at Widow Winters'

from the introduction:
Wrongdoings at Widow Winters’ is a stand-alone, ready-to-run Wild West adventure. This scenario is well suited for a one-shot adventure playable in a single gaming session, for a party of about four to six 2nd to 4th level characters. It is also the first key event in the Saving Stetson City campaign described in Module M1 and can be run as the first episode of that campaign, but it is not necessary to have M1 in order to play this module.