Umbra
"The adventure begins with the PCs lost in the streets of Sigil's Lower Ward." --from the module.
The PCs are approached by a tiefling telling them about a job. The tiefling's employer wants the heroes to search for a child who is rumored to be some sort of chosen one from an ancient prophecy.
Includes a map of Durkayle's Stronghold, a map of the Black Sail Tavern, a map of the Screaming Tower, and an isometric map of Zactar Cathedral.