Look what I found:
The book describes the alternate world where October revolution of 1917 has spread to Western Europe and then USA, the socialist world system including all the main developed countries was formed by the end of 1920s, the second world war never happened, and advanced socialism began to evolve into real communism sometime in 1970s...
What can I say?
IMHO the original idea (spread of Russian revolution to the West) wasn't entirely impossible. This is not even alternate history, this is something that actually happened (socialist revolutions in Germany, Hungary, Finland). Alas (or fortunately, depending on your views), the trend was then aborted and reversed. But we can imagine the other course of events where, say, November revolution of 1918 in Germany turned out successful and Germany (instead of Russia) became the center of the forming socialist world and a much better role model for other western countries.
I'm not so sure about USA. IMHO more likely scenario is that US bourgeoisie, terrified by european events, wound switch to fascism sometime in late 1920s and then, again, the world war(s) would become a real option.
The REAL communism by 1970s is even less likely, under any course of events. IMHO the transition period, even in absence of enemies and serious obstacles, will take much more than two or three generations.
And finally, typically for Western leftists, author believes that the whole Soviet history after Lenin's death was a kind of "deviation" and replacing Stalin with Trotsky would fix this. I don't think so. The Soviet system (with all its strengths and flaws) was exactly what was possible to build in the given historical circumstances. And, driven by these circumstances, Trotsky would be doing roughly the same.
Still, the interesting book.