I’m starting to wonder if Fritz Leiber’s early fiction is where it’s at in terms of sophistication and daring, while his later fiction is pure career fancy. If so, it’s probably an observation longtime readers of SF have already noticed, but of the small assortment of his works I’ve read, it’s becoming a pattern.
Leiber’s 1945 Astounding serial, Destiny Times Three, blends Nordic myth, Persian poetry, and a little bit of Wells into a multiverse story that explores a provocative moral question: What would you do if you found out your multiverse twin exists in a miserable dystopia and they resented you for having the better life?
A sense of guilt toward his dream-twin was the dominant fact in Thorn’s inner life. (23)