The Legion of Time

Nice quick adventure, still well readable. Needs quite a bit of suspension of disbelief - utter good and utter evil exemplified by two beautiful women ruling over their respective cities! Add to that the enormous number of enemies overcome - if you can overlook that you will enjoy the story.

The concepts of alternate timelines and a single event separating them (good choice btw) must have been highly orginal at the time. Bonus points for explaining them with quantum mechanics!

Worth reading as a document of the history of Science Fiction but also as a novel in its own right. Recommended.