More Doc Smith. I like them, they are a good light read. Again from the period prior to his "Lensman" series which is still in copyright.
They were four of the greatest minds in the Universe: Two men, two women, lost in an experimental spaceship billions of parsecs from home. And as they mentally charted the Cosmos to find their way back to earth, their own loves and hates were as startling as the worlds they encountered.
I was doing some Doc Smith and noticed that this was missing from the IMP area.