The Others by John Russel Fearn

Between the atoms of apparent solids there are spaces as comparably vast as those between this world and the nearest galaxy. Nature has ordained it that the atoms of countless worlds fit exactly into the spaces which are left between, in a great interlocking process. And Onia, a mysterious girl from another plane of matter has been projected to Earth…

John Russell Fearn (1908–1960) was a British author and one of the first British writers to appear in American pulp science fiction magazines. Always a highly prolific author, he published not only under his own name, but also as Vargo Statten and other pseudonyms including Thornton Ayre, Polton Cross, Geoffrey Armstrong, John Cotton, Dennis Clive, Ephriam Winiki, Astron Del Martia (and others). He remains best known for his long-running Golden Amazon saga. At times these drew on the pulp traditions of Edgar Rice Burroughs. Fearn also wrote Westerns and crime fiction.