Dive into the realms of science fiction with the Ace Double featuring "Agent of the Unknown" by Margaret St. Clair and "The World Jones Made" by Philip K. Dick. Published in 1956, this paperback edition offers a double dose of speculative fiction genius, with each book providing a unique journey into alternate worlds and unnerving realities. With 128 pages in "Agent of the Unknown" and 192 pages in "The World Jones Made," readers are treated to a substantial experience of these classic tales. Both stories are presented in English and showcase the inventive storytelling that has become synonymous with the science fiction genre. Whether you're a collector or a first-time reader, these novels are sure to captivate and engage with every turn of the page.