First Edition stated. Bleiler and Hubin listed novel of mystery and horror in which a beautiful girl is subjected to scientific experimentation hidden away in the Valley of Creeping Men. "Guarded by a yellow ape, almost human in its passionate and jealous love, she is found by Shackleton, the psychologist who is carrying out the dying instructions of Marakoff and searching the valley for hidden treasure. The story moves to the rhythm of tomtoms and the wailing of voodoo rites. Death lurks and strikes mysteriously in the heavily scented tropical nights". Near Fine in Very Good dustjacket with few masking tape mends at verso and at exterior at lower spine end and flap corner.