This quest is not available in game.
Speak to Elling Trias in Stormwind.
So yeah... um... I might know something 'bout that meeting at Addle's Stead. Happened a few weeks back I think. I really didn't have any part in it. Me part was done when plan A failed... damn adventurers.
The guy we got on the inside for plan B came out of Menethil; guy called Slim. That's all I know regarding their backup plan.