As dozens of doors to a strange land between dimensions begin to open throughout the Heart, the delvers step through to find the city of Elsewhere in turmoil. The lights which keep them safe are going out one by one. An ocean of vicious darkness roils at the edge of Elsewhere and seeps through to the City Beneath.

This scenario sourcebook for Heart: The City Beneath offers full details on the city of Elsewhere - the people who live there, places to visit and/or get mugged in, the tensions blossoming as the lights go out, and plenty of options as to whos behind the theft of the power crystals that keep the city alive at night.