Hideout

A guild for hire by anyone with enough coin. Right now Black Earth has put out a contract on any high elves the guild can find. They are to capture them and bring them back to their hideout. Then a cult member will come and take them away to the underdark. If the elves in the party draw too much attention to themselves they will be targeted by this guild.
Use the hideout from the waterdeep pdf if needed.

Kidnapping a player

Addy, A female human is a part of the guild that specializes in kidnapping people. She will approach the target pretending to be a prostitute. when describing her appearance be sure to mention that she has largish satchel with a beautiful embroidered pattern on it. She will try to solicit the character. if she success she will charge 10g and take him to her room. Where she offers him a vial and says she would like for him to drink it to "increase his potency" this will actually put him to sleep in one minute. first 20 second he feels nothing. Next 20 seconds he feels woozy. Last 20 seconds he is about to pass out. she will attempt to restraint (grapple) him if he catches on to the gig. The satchel she has is a bag of holding. She puts the character inside and after an hour walks out of the bar DC10 perception to see that the bag is full whereas it was empty before.

Tracking down

The only lead the party has is finding Addy.
If they roll investigation in Oak Ward or Maple Ward they will find nothing.
Birch District they will find a bartender (John) who knows the lady they are talking about, she came in a few nights ago and went upstairs with a gentleman, and she came back down about an hour later. Now that you mention it I havn't seen that halfing fella since.
If they investigate in the Roots District the will find a bartender (Trent) who knows has information on Addy. He will not just give up the info unless he gets paid. What he knows: She has been doing this in the city for a few weeks. works with local underground groups, they probably kidnapp people here to sell to slavers way east (no not the Dryadalum Empire). For some extra gold he can point you in the direction of their hideout.
It will take about 1/2 a day to investigate one district. It they do not find the hideout after the first day the kidnapped player will be given a chance to escape. on the morning of the second day he will be moved to the sewers (?)

Hideout

There is no one central location that the guild operates out of, instead they have many small hideouts. A kidnapped character will be taken to one they have made specifically for holding captives.

FL1

There is a slit in the door that can be opened. The thug at the door will only open if the code word, iofiow, is given. Inside there are 2 thugs at the table playing cards. If the players start a fight a bandit captain will come out of the side room with his pet black bear and the thug on FL2 will come down.

FL2

There are 4 cells and a thug watching everyone in them. Every 2 hours the thugs change shifts. In the first cell is the PC with another high elf. in the second cell is a halfing. in the third cell is a wolf. the 4th cell is empty.
All of the prininors belongings ar ein a chest on the far side of the room
The thug watching them will doze off on occasion.
The keys for the cells are on the table next to the thug. Lock pick DC is 15.

Black Earth

If after two days there has been no rescue a drow and duergar will come to the hideout, each with a modified bag of holding. Two thugs will go upstairs with them. The BE with sedate the high elves by asking them, or forcing them to drink a potion. Then they will be placed in the bags and taken to the underdark via the Yawning Portal.

Guild Members and what they know

Vindedo (dragonborn) is the highest ranking member here (bandit captain). Vindedo is a tough fella and wont offer up information easily
DC 14 the guild is getting paid by some drow and duergar to kidnap high elves. They come by weekly to take whoever we captured.
DC18 intimidation: He knows that Cult of Black Earth hired the thieves guild to kidnap high elves. He knows that a drow or duergar comes by every week to take the captives into the underdark with modified bags of holding. He believes there is an entrance to the underdark in Springs Dawn that they use. He doesn't know where the entrance is but there are more of his guild operating in the sewers below. Ramus would know more.
Robbie is the human who guards the front door. DC 14 intimidation: Him and the other thugs know the guild is getting paid by some drow and duergar to kidnap high elves. They come by weekly to take whoever we captured.

Prisoners

Falmir The high elf. An old high elf with a long wispy beard and a shiny head. He worked as a blacksmith for the Dryadalum Empire for hundreds of years. Now in his retirement he is exploring the world. He knows mage hand and can get the keys from the table, but is afraid of alerting the guard. Falmir was kidnapped 3 days ago when he came into the city for the sappening. The guild has captured him for Black Earth.
Alf the halfling. Short even among his people and has fire red hair. He is not partial to high elves. He is a trader from Alesia. He has come down here to buy saps to sell up north for a profit. He has a lock pick on him and wants to get himself out. He may help the high elves, but he isnt willing to risk his neck for it. He has a +5 to his lockpicking. ( the guild has captured his to put into slavery far down south of the Dryadalum Empire.
Killer the wolf. The guild has animal fights in the sewers, which Robbie has recently caught this wolf for. it is not a friendly animal.