THE CROSSROADS OF TIME. By Andre Norton, Ace Books, Inc., New York, 1956.
 
Science Fiction
Ace #12311
(Crosstime/Blake Walker #1)
Vintage from the 1950s
 
A chase through alternate worlds
 
The story takes its protagonist through several versions of Earth as it might have been if history had gone differently.
Everything gets a second chance! That's the shattering discovery Blake Walker made when he learned that there are innumerable parallel worlds - on each of which history has taken a different alternate path! 
 
When Blake Walker foiled a murder attempt on one of his neighbors he somehow found himself drafted into a frantic chase for a dangerous criminal - through the almost infinite levels of alternate Earths. Blake crossed from Alternate Earth to Alternate Earth in a search for the means to save his own home world from disaster!
 
Secure binding with a mild bottom spine shift and mild cover wear. Softcover book with 169 pages.