Heart: The City Beneath - RPG Core Book (Special Edition) - Rules of Play says:

Heart: The City Beneath is a tabletop roleplaying game about delving into a nightmare undercity that will give you everything you’ve ever dreamed of – or kill you in the process. It is a dungeon-crawling, story-forward tabletop RPG from the designers of Spire that focuses on what characters have to lose in pursuit of their dreams in the chaotic darkness beneath the world. This special edition is a cloth and faux leather quarter-bound hardback book featuring exclusive foil-stamped cover art by Felix Miall.