Photographer Eddie Drake had expected a challenge when he joined the archaeological expedition to the lost city of El Lobo, but he was unprepared for the bizarre terrors that lurked beneath the Mexican mesa. The deeper the party descended into the ruins, the more unbelievably horrifying it became. Huge slug-like monsters with a hunger for flesh left trails of slime and blood through the hellish labyrinth, but the greatest terror was yet to come, as the men realized with growing panic that the cavern walls were actually composed of living flesh . . .