The disappearance of Colonel Fawcett in the Matto Grosso remains one of the great unsolved mysteries. In 1925, Fawcett was convinced that he had discovered the location of a lost city; he had set out with two companions, one of whom was his eldest son, to destination 'Z', never to be heard of again. His younger son, Brian Fawcett, has compiled this book from letters and records left by his father, whose last written words to his wife were: 'You need have no fear of any failure . ....