E.E. 'Doc’ Smith 
Subspace Encounter 

Bursting right through the four-dimensional travel zone of subspace, Tellurian psiontists make an amazing discovery on the other side. Beyond the bounds of subspace, a parallel universe is cruelly ruled by a violent, murderous empire, the Justiciate, where psiontists are ruthlessly hunted down and fed to giant eagles.And within the Justiciate are lodged spies and traitors, dedicated to its overthrow – evil agents of the proud Garshan 'master race’.The arrival of the psiontists from Tellus triggers off a truly spectacular space adventure…