A series of brutal murders all share a particularly grisly characteristic: each victims has his or her heart cut out, much like a human sacrifice. Kolchak discovers that the murders are all connected to a modern-day Aztec cult that has been preparing for an apocalypse for centuries. Kolchak tries to stop the final sacrifice from being made, but he soon discovers that the mummified corpse of the cult's leader may not be as inanimate as it appears.