Destiny Times Three is a short novel, originally serialized in 1945. The same people lead different lives in three branching timelines, brought into existence by a ‘Probability Engine’. One world, which has a dictatorial regime attempts to invade another. An enjoyable yarn with overtones of supernatural fantasy and a whiff of allegory; but it’s a pity Leiber didn’t choose to extend it and polish it for the 1957 book publication.
The Ultimate Guide to Science Fiction – David Pringle