An ancient song leads to a deadly race to find Genghis Khan's tomb.
Former special ops officer Grant Casey thought that the Bone Guard was a good idea. A team specializing in securing historically important archeological digs across the globe -- how could it possibly fail? A distinct lack of clients indicates that the idealistic vision of the Bone Guard may not have been such a good idea after all.
Just when things seem doomed to fail, Casey runs into university researcher Liz Kirschner, who has just uncovered what looks like a map to Genghis Khan's tomb. An assassination attempt, an arson at her research library, and the bankroll of a mysterious Hong Kong billionaire clinches it: The Bone Guard has their first client.
Facing a Chinese government that wants to destroy the tomb of the man who conquered their land, the Bone Guard hunt for clues from Cambridge, England, to the steppes of inner Mongolia, the whole time dodging assassins, government police, and relying on a Hong Kong billionaire who seems to be manipulating them for his own ends.
As the forces converge on the map's stunning archeological destination, Casey's idea of the Bone Guard turns out to have been a very good one indeed.