Finder's Fiend

Publisher's blurb: Souls bound to a deadly fiend have escaped the Nine Hells and taken over denizens of Thentia. The devil wants the souls back and if they're not delivered quickly, she intends to come for them herself, endangering more innocents. To save the lives of the unsuspecting hosts, adventurers must track them down and send the stray souls back to Hell. A Two-to-Four-Hour Adventure for 5th through 10th Level Characters (APL 8).