From the introduction:
Spiderhaven, a subterranean barter-town along the River Sargauth, has been overrun with drow, and the Lords of Waterdeep are asking for your help in dealing with the problem. Are you up to the challenge?
A one-round special adventure set in Undermountain for 4th level characters.
This adventure guide adapted the commercially published Expedition to Undermountain to RPGA convention/tournament timed play. The commercial module is required to use this product. Characters are assumed to be of 4th level, and for RPGA play must conform to guidelines given in Undermountain Adventures Character Creation Guide.