Publisher's blurb:
Add a new villain option and cunning criminal organization to Waterdeep: Dragon Heist. Hlaavin, a half-doppelganger/half-illithid crime boss, runs the UNSEEN, an illegal cabal of assassins, thieves, spies, illusionists, and shapechangers that plots to rule the city from the shadows. Written by Dragon Heist designer James Introcaso.
This supplement includes:
Background information for Hlaavin and the Unseen and Shieldmeet, the Forgotten Realms' leap day holiday
Advice for blending the Unseen seamlessly into Waterdeep: Dragon Heist
Eight new encounters and a new encounter chain to go with chapter 4 of Waterdeep: Dragon Heist
A new villain lair for Hlaavin and the Unseen with incredible cartography
A high resolution version of the map