(From the publisher):
While seeking to solve the mystery of "the trained vampire murders," Doc Savage and his amazing crew suddenly find themselves prisoners of Sol Yuttal and Hadi-Mot aboard a hijacked Zeppelin. Their deadly destination is a fabulous lost diamond mine guarded by carnivorous plants and monstrous, bloodsucking bats.
First published in Doc Savage Magazine # 7 September 1933 - written by Lester Dent.
Original title: The Lost Oasis
Genre: Fiction→ Adventure→ Male-Action/Adventure