Storm King's Thunder
Nuvruil was introduced to the group by way of a contact of Lusha's. Back in Silverymoon, she took a contract from a wealthy elf named Saeval. He promised to pay her way in the Ladys College if she located his nephew (Nuvruil) and reported back to him.
Lusha quickly teamed up with some fellow adventurers and went on her way. They located Nuvruil in Waterdeep almost immediately, but instead of reporting back, the new adventuring party did some legwork for their new patron collecting artifacts from the Waterdeep area.
Unfortunately for our heroes, the individual they found was not Nuvruil. The elf had been murdered hours before they 'met.' The person they met was a tiefling wizard named Brash, and he had more sinister plans. Eventually, he drugged them and dumped them through a portal, but not before recording a scene of him gloating about it and sending that through with them.