[Blue Streak]

spoiler

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Near the Umar Inn in Umar Hills are four merchants, Min Minling, Ellence Fielding and two others, one of those two is a potion/scrolls/books seller.
If you buy the book 'History of Zhentarim' he will ask you to say his true name if you say the right name he will give you a quest. You have to have done the skinner murder quest in the Bridge District though...