Hello there, <name>. I've heard a great deal about you. Listen closely, you're only going to have one solid shot at this.
The new Defias Kingpin must be inside the hut orchestrating this entire operation. I want you to go inside and take her down, for the sake of the hundreds of innocent people the organizationher father started has killed and terrorized.
I'm shocked that she would let you get so close to her domain without fleeing and waiting until more favorable conditions, but it seems we're in luck.
("The brotherhood ends here.")
Completion
You very well may have saved all of Stormwind with your efforts here today, <name>. Vanessa may still be out there, but she is an insignificant threat now that the Juggernaut will be placed under our careful watch. Thank you.
After defeating Admiral Ripsnarl, Mathias Shaw radios in, offering this quest. Still on top of the ship, look in the southern room to see a shadowy figure. Mathias and Horatio Laine and the rest of SI:7 expect that it's Vanessa VanCleef in there. Walk inside to find...
See his article for more information on defeating him.
On Cookie's death:
Laine runs in from below along with some investigators and Crime Scene Alarm-o-Bots.
Lieutenant Horatio Laine says: The false Kingpin has fallen thanks to you adventurers.
Lieutenant Horatio Laine says:Vanessa VanCleef is still out there somewhere, plotting against us. Thankfully, without this base she is largely powerless against the might of the Alliance.
Lieutenant Horatio Laine says: I'll be sure to keep an eye on things as we begin cleaning the Deadmines out. Hopefully we can use it again soon as the famous gold mine it once was. As for the kingpin's fate...
Lieutenant Horatio Laine says: I guess that's thee way...
Lieutenant Horatio Laine says: ...the Cookie crumbles.