This quest is not available in game.
Find Bishop DeLavey in Stormwind Keep.
Excuse me, sir . Bishop DeLavey asked me to approach adventurers that might be able to help him with a delicate matter.
If you could quietly head to Stormwind Keep and speak to him at your earliest convenience, I'm sure he would appreciate your help. Again, please be discreet. It is a matter of some importance.