Meet the another sci-fi story from the master of adventure and science-fiction novelist of the pulp era Otis Adelbert Kline, best known for his interplanetary adventure novels set on Venus and Mars, which instantly became science-fiction classics. Smaller than a microbe, the Stranger was but how he grew! Ralph Blake’s surprise kidnapping flung him into fierce adventure in the torrid Sahara. Then a strange creature from Mercury stepped in and even Ralph’s death couldn’t prevent him from unraveling the network of intrigue! With an exciting narrative full of thrilling action sequences, memorable characters, and a fascinating civilization of bizarre wonders, it is a great adventure novel that will thrill fans of classic science fiction.