Misdeeds in Moonbrook

The NPC dialogue that goes along with this quest:

Cecilia Clessington says: Did you just... call me a hostage? Wait, aren't you--

Vanessa VanCleef says: Vanessa VanCleef, leader of the Defias Brotherhood, "at your service".

Cecilia Clessington says: Oh dear.

[npc=198883] rides off on horseback, with [npc=198912] following behind. The player meets back up with them in Moonbrook, and finds that [npc=198924] has rejoined the party. Two [npc=199584]s can be seen lying dead on the ground, and the group can be heard discussing the sudden abundance of Clessington's agents within the small town.

Master Mathias Shaw says: Do you see them? There's more of these agents from Clessington skulking about.

[npc=198922] says: I had no idea he brought on so many...

[npc=198923] says: This isn't right. Where is everyone? Where is my Brotherhood?

This is the questline for the [race=1] Heritage armor.
For this questline you must have a human at level 50+ who is exalted with Stormwind.
The first quest popped up after login (but just in the quest tracker, no quest window) and wants us to meet [npc=198884] in Stormwind. If you didn't get the quest, try to find it at the Stormwind Embassy in the northwest.

1. 
   
2. An Urgent Matter - meet [npc=198884] behind the castle in Stormwind
3. 
   
4. An Unlikely Informant - meet him again in the basement of the inn in Goldshire, Elwynn Forest
5. 
   
6. A Window to the Past - talk to him (cinematic)
7. 
   
8. Rotten Old Memories - travel to Morgan's Vigil in the Burning Steppes and talk to [npc=9563]. Find 4 pieces of journals at /way 62.26 63.95 Cave entrance
9. 
   
10. Looking for Something Specific - return to Goldshire
11. 
    
12. The New Clessington Estate - travel to the west of Duskwood /way 10.03 55.43 entrance, upstairs and talk to [npc=199536]. Leave the building and talk to her
13. 
    
14. Misdeeds in Moonbrook - travel to Westfall
15. 
    
16. A Hungry Heritage - enter /way 42.52 71.58 and go to the marked area. Open your big map to make it easier
    Supply Only the Finest Goons- kill 16 enemies
17. 
    
18. Betrayal of the Brotherhood - escape from the underground (north). Use extra button [spell=397607] to make it faster
19. 
    
20. To Northshire - travel to Northshire (in the north of Goldshire)
21. 
    
22. Knock It Off! - kill and loot the 4 marked enemies
    What's Their Problem? - kill enemies to fill the bar
23. 
    
24. The Clessington Will - enter the Abbey and click the barrier. Click extra button Will to Survive, kill the enemies and defeat [npc=199006]
25. 
    
26. Will to Survive - pick up [item=204214] and give it to Master Mathias Shaw. Click extra button Will to Survive. Kill [npc=199008]
27. 
    
28. Go with Honor, Friend - return to Stormwind at the main entrance. Talk to [npc=198884] and go to [npc=65153]. Click extra button [spell=398747] while standing in the light
    - turn in, get your [spell=399752] and the title [title=760]
29. 
    

Questline took about 25 minutes with level 61, incl. cinematics and flights.

Lionguard red [outfit=460885]
Lionguard golden [outfit=460884]
Lionguard blue [outfit=460883]

Vanessa: ...at my home? ...

Girl: did she just call me a hostage? then they both ride off on horses at the same ordinary pace.