From publisher blurb:
The first Thunderscape adventure path begins here!
Times are tough for adventurers in Aden, and the high-paying bounties offered by the Cogswheel Irregulars in Mekanus are a great place to save up a few crests for traveling. As representatives of the Urbanan government, however, the player characters soon find themselves in the crosshairs of a group eager to retrieve forgotten secrets from the most dangerous parts of the city, and they are only the first ones to paint a target on the characters' backs!
Heart of the Machine includes the following:
- An adventure in four acts!
- A primer and map of Mekanus, the largest city in the Known Lands!
- Details on the mercenary lawmen known as the Cogswheel Irregulars!
- New NPC profiles and bestiary entries!
- And much more!