Dance Hall of the Dead by Tony Hillerman
Two Native-American boys have vanished into thin air, leaving a pool of blood behind them. Lieutenant Joe Leaphorn of the Navajo Tribal Police has no choice but to suspect the very worst, since the blood that stains the parched New Mexican ground once flowed through the veins of one of the missing, a young Zuni. But his investigation into a terrible crime is being complicated by an important archaeological dig… and a steel hypodermic needle. And the unique laws and sacred religious rights of the Zuni people are throwing impassable roadblocks in Leaphorn’s already twisted path, enabling a craven murderer to elude justice… or, worse still, to kill again.