Mortal Death of a Myth' records as a diary and journal the adventures of the central character during the fifteen months he is trapped inside an uncharted valley in the brazilian rain forest. His only companion is a young woman with whom he is unable to communicate freely because of her apparent lifetime of isolation from civilisation. The young couple circumnavigate the valley seeking avenues of escape but all-encompassing cliffs thwart that ambition. All they can do is attempt to dig a tunnel through the cliff face. Discovery of skeletons inside the partially excavated tunnel provide clues as to how the young woman became trapped inside the valley and to her possible parentage. Their partnership is dramatically ended by total destruction of the valley in which they had began to build a life together. Survival of the young woman gives credence to the Paruiru Indian legend of the Goddess of Life and of The Beginning. The authorities assume the central character perished during the destruction of the valley and concentrate their efforts on establishing his identity and nationality.