After helping dispatch three devils on the top of Troll Skull manor, Bowdin and Chip join the tiefling Aries in his task to track down the summoner of the devils.  

Aries invites Bowdin and Chip to join him when returning to the WaterDeep guard to receive payment and are tasked to discover who is responsible for bring the devils to WaterDeep.
The trio find the Summoner dead in a warehouse near the summoning circle. 
Further investigation of the summoner reveals the summoner to be the niece of Lady Haventree, the hostess of the Rose Ball. The same ball that Adrok or Kelgrace were invited/tasked to attend.
While attending the Rose Ball, the adventurers encounter several individuals they have encountered in the journeys. 
The social encounters lead to Kelgrace meeting in private with a sharp dressed elf. 
The private meeting is interrupted with the discovery of a dead elf in the room.