From the front of the book:
Welcome to Ptolus Adventure Maps: Madame Kaethea’s House. Inside you will find 13 terrain tiles detailing the three levels of this unassuming hideout nestled among the slums of the Warrens.
Madame Kaethea’s House serves as a hiding place as well as a common meeting point for dark elves in the city. Located beneath this building is a secret temple to the Mistress of Spiders and a connection to the sprawling caverns beneath Ptolus.
Ptolus Adventure Maps feature detailed miniatures-scale map tiles of locales pulled straight from the pages of Monte Cook’s Ptolus! Simply print them, trim them out, and bring the excitement of the City by the Spire to your tabletop.