Having pursued and destroyed the fleeing Fenachrone colony spaceship, The Skylarkers decided to explore the galaxy seen up ahead, to take the opportunity offered by the great velocity resulted from the chase and the distance they had traveled.

The Uranium metal store of the Skylark Three - used for powering offense and defense - was no match for the inexhaustible cosmic energy at the command of the Disembodied Intellectuals.

Running out of power and having no other choice, Seaton decided to try the heretofore one-way trip: a rotation into the "Fourth Dimension" in the small Skylark Two.

They ran across the so-human-like Valeronians, who were in the mortal struggle with the hypnotic, amoeba-like, shape-shifting Chlorans, and helped them to win the war.

The Astounding reviewer, P. Schuyler Miller, received the novel favorably, saying the Skylark stories "had a simple reasonableness about them which made their advent a milestone in science fiction".