This is a nifty one-shot adventure with a unique scenario and well worth using as a start point for a campaign, especially if the Dungeon Master wishes to head into the Underdark in Faerun.
The party are "tradies" and are contracted for some service work. Getting to the worksite has some hazards and a simple job turns into something not so simple.
There are lots of descriptive notes here to help the Dungeon Master and multiple outcomes are provided for. The maps are straightforward and allow for easy customisation by the Dungeon Master should they so desire.
Well worth adding to your collection :)