Book 9 in the series.
A renegade Chinese Colonel in the western part of China is committing genocide in his region, wiping out the natives there. The Communist Party wants him stopped but to do so itself would have too many political ramifications. One of the leaders turns to the leader of a triad for help and that man, an old acquaintance of Gabriel Wolfe, knows just the man to do the job.
Note: this contains the first mention of Tara Wolfe and how she became the assassin Wei Mei.