La voce misteriosa

Once the rebel Comanches have been defeated and a dangerous band of smugglers who had supplied the Indians with rifles defeated, a new, dark threat appears before Tex Willer! A monstrous apparition is terrorizing the surroundings of Morelos: a frightening screaming ape, riding a black steed, gallops through the night armed with a machete in search of heads to cut off! The invalid Juan Barrera, his mixed-race assistant Mayumba and his daughter Miranda are hiding an unspeakable secret...