For more than four decades, New York Times and USA Today bestselling writers Kristine Kathryn Rusch and Dean Wesley Smith wrote professional science fiction short stories that won awards and sold millions of copies.

Now, for the first time, they collect together 120 of their science fiction short stories into a six-volume set called Colliding Worlds. Sixty stories total from each author, with ten stories from Rusch and ten from Smith in every volume.