The Lost Catacombs/Lair of the Red Bandanna Bandits

From the introduction:

The Lost Catacombs lie beneath the rubble of a ruined temple, only the foundations and some walls still standing. A cleared stairway leads inside, to where a group of bandits have taken up residence, calling themselves the Red Bandanna Bandits, after the red cloth that they wear on their heads. They have stored up a sizeable hoard after several months of raids. Recently, after some misjudged exploration, they disturbed some undead and have been on their guard ever since. They are considering leaving, if the undead problem gets any worse.