The peace holds. The earth does not.
Two years after the Accord of Ashes was signed in blood, the alliance between orc, goblin, and human is still standing - but the world beneath it is not. Two of the three heartstones that bind Gor'tharak together remain lost: one shattered and scattered across the Ironwood, one locked in a human cathedral treasury under a doctrine that calls its very existence heresy.
Needle, the goblin alchemist who first heard the earth cry out, leads an expedition into lands no goblin has walked in a thousand years - to recover a stone that may be dying, guarded by a species no surface-dweller has ever met, and to make a discovery that will force her to choose between healing the world and asking its permission first.
Back home, Pinch has inherited more than Skitter's office. She has inherited her ghosts - and an exiled cipher-clerk offering the one piece of intelligence that could expose a militant church order quietly hunting the Accord's couriers, in exchange for asylum Pinch isn't sure she has the right to grant.
And in the borderlands, a soldier of the Order of the Burning Eye watches, counts, and waits. He has a chisel. He has nails. He has orders that have nothing to do with mercy.
The quest to heal the earth may be the very thing that breaks the peace it was meant to save.
The Heartstone Quest is Book Two of The Unseen Alliance - a five-book epic fantasy series about what it costs to keep a peace nobody was sure would survive its own signing.