A banished detective. A body drained of blood. Mexico’s vampires are all too human.

After graduating from Harvard, Artemas Salcido is determined to transform Mexico’s justice system and joins the federal police. He begins solving crimes committed by the rich and powerful and is banished to the village of Bustamante.

On a college field trip to Bustamante’s nearby caverns, the daughter of a US senator is brutally murdered. The FBI, the international media, and a Mexican hit squad tasked with making the problem go away descend on the village. When Mexico’s attorney general tells Artemas his career depends on his cooperation, Artemas realizes his life is at stake.

As other grisly murders occur, Artemas’s investigation uncovers an ancient blood cult connected to a powerful financial cabal that stretches from mediaeval Europe to Mexico's most influential politicians and businessmen. When he disputes his violent colleagues’ bogus solution to the crime, Artemas is marked for death.

Can Artemas’s determination to bring fairness to Mexico’s justice system prevail against the overwhelming power of his government—or will it prove fatal …?