The Green Shiver by Perley Poore Sheehan

SHATTUCK, that morning, had left his people well back in the Nan Shan. They'd been on their way through the mountains, headed for Tibet, when they'd come on the dying Chinese who'd told them of the murdered missionary and his wife, and their daughter, Laureen, and then of that grinning horror of a warlord, General Jade, the Green Shiver.

Just over the mountains from China, and Minchow, in the Tibetan highlands lay Koko Nor--Koko Nor, the Blue Lake. It was at Koko Nor that Kubla Khan had established one of his capitals. Where Kubla Khan had passed, there Shadak Khan would follow.