Against the Thieves Guild

From the back cover:

The heroes are tasked with retrieving a magical lockbox, and its contents, secured in an underground vault secluded in the ruins of a nearby city. Sounds like a straightforward heist operation. But the heroes no only blunder into cunningly-designed trap-filled corridors and rooms, but become embroiled in a centuries-old rivalry between master thieves. Assuming they survive the deathtraps, the heroes still need to deduce how to open the enchanted lockbox to claim their prize.

Against the Thieves Guild is an adventure for four to six 4th level characters. The adventure is a dungeon crawl through a trap-laden vault. This adventure can easily be dropped into the GM's own campaign.