One of the Lords of Waterdeep was assasainated and the other lords are in a panic because they do not know who did or or even how the lord was killed. The Lords have put together a request for all adventurers to come to Waterdeep and help them solve this problem before it gets out of hand.
This specific lord was one of very high class and was very popular with everyone in the city and outside of it as well. His name is known through out the land of Faerun and of Amn. He was one of the best merchants of the time, however he did make a lot of enemies with rival merchants.
At the present time, the lords are trying to cover this incident up for as long as the can but the scapegoat they have chosen might not hold up for much longer. They know it nwill get out eventually if it hasn't already. Now the other lords are afraid this assasin or whomever he works for might know who all the lords are, being that their lordship in the city is known only to the lords, and that the assasin might come after more of them.
The lords have several people searching for the one(s) responsible for this but so far they have gotten nothing. Coincidentally, some of their best agents are out in the land doing other missions right now and there is no way to get them to come back to help clean this up. They think something is fishy but don't know what.
Is there anyone in the land who is up for the challenge?