Skylark of Valeron
Edward E. Smith
Mass Market Paperback
(Pyramid, Jan. 1, 1963)
As the mighty spaceship Skylark roved the intergalactic world, scientist Richard Seaton and his companions uncovered a world of disembodied intelligences. A world of four dimensions where time was insanely distorted and matter obeyed no terrestrial laws... where three-dimensional intellects were barely sufficient to twart invisible mentalities!