Laos, 1979: Dr. Siri Paiboun, the twice retired ex-National Coroner of Laos, receives an unmarked package in the mail. Inside is a handwoven pha sin, a colorful traditional skirt worn in northern Laos. A lovely present, but who sent it to him, and why? And, more importantly, why is there a severed human finger stitched into the sin's lining?

Siri is convinced someone is trying to send him a message and won't let the matter rest until he's figured it out. He finagles a trip up north to the province where the sin was made, not realizing he is embarking on a deadly scavenger hunt. Meanwhile, the northern Lao border is about to erupt into violence—and Dr. Siri and his entourage are walking right into the heart of the conflict.