This is a very good adventure... notable far more for the possibilities afterwards than for the adventure itself. The entire adventure setup is a little dubious given the demand placed upon the PCs (a good party would probably decline the offer). However, once they're engaged in it, there are plenty of perils and dangers to deal with.

However, the events set into motion during the adventure could be the beginnings of an campaign unto itself. This is a good cheap adventure for 1st level characters and, if it inspires a campaign, you've more than made up your investment with it.