"Well than. Anyone know anyone in Blackstaff Tower? Our target as it were is about to attack it," Sybil states matter of factly without a real concern.

"Then let's be off! I think our friend Alberich is there." 

Delmalis shrugs, “That could solve our problem right there, but we should send them a message about the coming assault. If he’s still at the tomb, we should try and catch him there without his people.”

Twitch growled and nodded to Sybil.

 You all head over to the City of the Dead. Roll Investigation or Perception checks to see if you can find the Thann crypt. 

Meep looks around carefully, checking the tombs as he goes - Investigation: 24 

Twitch followed Meep looking around.

Perception: 20

Meep, you find the Thann's crypt. You can also smell Sunblight's cheap odorant that smells like pine trees. 

The Thann crypt is a tad larger than the others in the area. It sports a blue shield with a white horse and a raven on it. The crypt's door appears to be open. There's no sign of Sunblight's men. 

Twitch approached the tomb carefully trying to peek around the corner of the door without being seen.

Stealth-24

Perception- 14

Twitch, your cat-like instincts keep you from being seen as you peek around the corner without a sound. With your Perception, you see a narrow hallway that leads to a door. You can also see the open spaces on both sides of the hallway that would be used to place coffins. 

Delmalis quickly and quietly looks around for any signs of his soldiers.

Stealth: 19
Perception:  7

" No one close.  Hiding spots along passage to door."

Demalis, you don't see any sign of soldiers. 

Meep, confident that Sunblight is not in the immediate vicinity, enters the Thann tomb.  He'll cast Dancing Lights to light up the interior. Is there anything unusual about the inner door?

You notice the tomb is clean and looks nice. You see a painting of a noble family. There's also a painting of a blond-haired man and a half-elven woman. Mable points to it and says," That's Danilo Thann and his wife Arilyn Moonblade. We're in the right place." 

There is a door that seems to swing black and forth. 

Delmalis moves quietly forward to slip through the door.

(How high is the ceiling here?)

The ceiling is about 20 feet above you. 

Also roll a stealth check. 

Delmalis stealth roll: 12 And if the door goes all the way up to the ceiling, Delmalis will walk up the wall to the ceiling and walk in on the ceiling.

I'll say you manage to do that. As you walk in you see a pudgy duergar with white hair that's styled and muttering to himself. He's surrounded by various documents. 

Delmalis gestures for the others to get ready and then follow in on his signal. He then tries to move quietly, as near to the distracted duergar as possible, still on the ceiling, then drop down with an echoing howl as the shadowy form of his draconic visitor briefly surrounds him.