Bodies are turning up in a city (or large town). The organs of the victims appear to have been turned to solid crystal; in a gruesome twist, the hearts of the victims have been carefully removed. The mayor and the guard captain have hit an impasse in their investigation. Agreeing to assist in finding the murderer, the party find themselves under attack by infernal assassins as they follow the clues to a gemcutter's workshop. In this rich and devilish adventure, the party must find and face a murderer and a charming devil.