You are caught in the wake of the Delving Machine: a device that bores through rock, blood, bone, space, time and reality, towards the scintillating terror of a crimson eternity.

As your journey progresses, you doomed delvers will encounter a trio of antagonists who each seek control of the machine to shape their ideal future: the arms dealer Ptolemy Bay, the aelfir politician Aramos, and The One Who Waits In Ashes, a ragged figure who appears all too familiar. You'll witness the dreadful impact of Zenith abilities – your Zenith abilities – on the places that they journey through. You'll venture via uncanny passages to Summersisle, home of the humans, on the eve of their greatest tragedy.

Dagger in the Heart is the first hardback sourcebook for Heart: The City Beneath, featuring a full-length campaign designed to take your gaming group to the Heart itself...

You are not the only group searching for the Delving Machine. During your descent into the Heart, you'll encounter many opponents, the greatest of whom are: