Louis never wrote or even planned a sequel to this book. He imagined a few scenes that might be in it, like what would happen if Joe Mackatozi confronted Col. Zamatev at an arms control conference, but he never really had a story planned out. There is, however, a strange connection with the short story The Skull and the Arrow (in the collection End of the Drive http://www.louislamour.com/shortstory/endofdrive.htm). The Skull and the Arrow was intended to have been a scene in the middle of “Last of the Breed,” the moment when Joe decides to escape Russia by going back to his Native American roots. Why Louis did not use this scene/story is also a mystery.