By W. W. Shols
Cut off from the rest of the universe by the force field that gives us the title of this book, Perry Rhodan battles enemy forces and the environment of the primeval world that is (or was speculated to be in the early 1960s when this was written) Earth's sister planet. Frankly, not a whole lot happens other than pieces being moved around on the game board in this middle part of a short trilogy of novels within the broader Perry Rhodan saga. This volume of the series is notable more because here each book expands to include backup short stories, making it more truly a "magabook" or "bookazine" (the editor's terminology varied). If you're interested in reading more about it, head on over to my other blog.