I'll jump in here and assume the OP meant 3.5 D&D. I can't recommend "
Shut In" by F. Wesley Schneider and James Sutter in Dungeon #128. I've run it for both my groups, once at level 2 and another at level 8 with significant creature updates and both groups equally adored it.
"
An elusive killer is leaving a trail of noble blood across the city. When the PCs are recruited to protect an influential spinster, they discover that more is afoot at Dromdal House than anyone suspects. In fact, they may be the ones who need protection. A D&D adventure for 2nd-level characters."
Best of all, one villain is updated with a nasty prestige class in Complete Scoundrel by WotC.
-DM Jeff