This quest is not available in game.
Speak with Talo Thornhoof at Camp Mojache in Feralas.
Talo Thornhoof, a Tauren elder in Feralas, sends a request for aid. He offered few details, but he did say that he needs agents for a matter both delicate... and dire.
Serve the Horde, <name>. Go to Camp Mojache in Feralas and speak with Talo.