" I must say that at the time of this review, I cannot recommend this version of the story, since it is available for free on the LibreVox app with an at least equal if not superior narration.
Reed McColm's narration, while certainly listenable, leaves some to be desired. The character voices are a little inconsistent and the reading has a halting character at times which takes me out of the story. To be fair to Mr. McColm, his reading improves vastly with other books such as the Lensman series.
The story itself is very entertaining, if you enjoyed The Skylark of Space then you will enjoy this. And yes, it includes more of the deliciously-villainous-but-utterly-respectable Dr. Duquesne, who is my favorite character from the first book.
Overall I recommend that you go for the free LibreVox version, even if this one was free I prefer the reading of the other. "
— Crazy Ivan, 5/11/2019