The final hour of Dia de los Muertos approaches, and LA's undead private eye is being called back to the underworld. But his deadly case still needs to be cracked. After tracking down La Fantasma, her co-conspirator, and Maria's missing son, Calavera is wounded in a gunfight. Weakened by the pull of Dia de Los Muertos's end, Calavera has visions of the underworld wherein he finds La Fantasma's own missing son. But back on the surface, La Fantasma and her co-conspirator attempt to make a deadly deal with the Devil. Can Calavera resist the call of the underworld in time to save Maria's son?