In the world of Ora, there stand two thriving yet disparate societies, both grown from the ashes of a great calamity. Cogrind is a mechanical marvel where every street, shingle, and wall is part of one great machine, able to move, shift, and fold to make life that much easier for the half a million souls that call the Shining City home.

One of those souls is Jack Dowton. The day he almost died was the best day of his life. He was offered the most enviable position in Cogrind. To learn at the feet of the man who moved the Great Machine, the Master Tuner.

The Greensea is a vast and unknowable forest. Every corner brims with life, presided over by a primal will, one that the local people call and worship as Dharra, the Goddess of Nature.

Sallah va Hawthorne is a young Druida, blessed with the power to bend nature to her will and the leader of the House of Hawthorne. Trained from childhood, she is tasked with guiding her people through the blades of conspirators and shadowed beasts of the brutal, primal forest of the Greensea.

Although they are a world apart, both will uncover pieces of an age-old secret. One that their ancestors hoped would be buried forever. When these two strangers are forced to work together, they will uncover a plot five centuries in the making.

Will they bear the absolution of these old sins, or will a city of half a million lives fall to ruin?