The Desecrated Church

This is a short adventure than can be completed in a single session, for 4-5 players of 1st level.
The old church at the edge of town has long been abandoned, but a week ago several robed figures arrived in town and have taken up residence in the old church. Since then, the townsfolk claim to have seen a strange mist around the building, and several folks have gone missing.
Little do they know, these cultists have awoken a long dead necromancer, who seeks to bind a dark power to its will.