Temple Hill (Forgotten Realms: The Cities series)

Among the dark streets of the city move thieves and cutthroats. And they don't like independent operators like Lhasha Moonsliver. But when she hires the town drunk as a bodyguard, she gets more than she bargained for. Together they'll have to battle the thieves' guild, the Cult of the Dragon, and other, darker foes. And a fallen man will have to remember the proud warrior he once was.