The Grave Robbers Chronicles, book 6: Graveyard of a QueenLei Xu2011

Lost in a swamp filled with murderous serpents, surrounded by invisible voices, and foiled repeatedly as they struggle to keep on the trail of Uncle Three’s lost love, the grave robbing team of Fats, Panzi, Qilin, and Uncle Three’s nephew find themselves in deeper trouble than anything they’ve encountered on their earlier adventures. Even when Uncle Three comes back on the scene and the elusive Wen-Jin ventures out from the shadows, the answers that that these two enigmatic people provide are troubling, not helpful.

Making their way through the subterranean irrigation system of a vanished empire, the grave robbers find more than they ever expected—and almost more than they can handle. Even Zhang Qilin is tested beyond his limits in Graveyard of a Queen, the sixth volume of The Grave Robbers’ Chronicles.