Okay, so I finished Helliconia Summer. While it's part of the same trilogy, it is definitely a different experience than Helliconia Spring. If it were up to me, I would say that this second installment reached the objectives (I presume) it set for itself, but there are several aspects that have left me wondering.
I’ll start with the negatives:
For one, as rich as the world-building is in this universe (and it is), I do not find it realistic at all that Helliconia's inhabitants are also humans, like the Earthers. Why? How? Out of all the possible evolutionary scenarios and contexts, the exact same species evolved on this completely different planet in a completely different—binary, mind you—solar system?!
Also, the main other species is basically a bovine derivative. Which is something Earth-native. Again, why? I sort of understand that it provides a sense of familiarity for the readers and that it is easier to relate to something so similar to what we already know here, in real life. But at the same time, not only are we talking about a completely different planet and solar system, but the real humans, as we know them, also exist there, in that same cosmos. So this wasn't conceived as a parallel, imaginative existence but rather as a "what if" scenario, supposedly related to our own real world.
Continuing on this line of inspirations derived from the real world, blatantly used in the story, I also didn't understand why the word "decade" had been adopted and redefined here (or at least, that's what happened in the Romanian translation, which I read). Up until the end of the book, where an explanation was offered, it was a very confusing term, considering that it encompassed 6 or 7 weeks or so.
So, in short, some aspects of the Helliconia universe (because this also applies to the first book) seem to have been rashly or forcibly integrated into the story. Maybe some different choices could have elevated its worth more. But that's just my two cents.
Regarding the positives:
The story is complex. The world is well-developed, definitely better than in the first book. The idea of summer changing the entire planet, its cultures, and level of innovation was well implemented, if I can say so. At the same time, the parallels with our own human history are incredibly strong, as this basically seemed like a tale from the Middle Ages, but on another planet. Again, this is not necessarily a strong point, but at least the plot was captivating. The characters were different and unique enough in their ways to engross the reader in the tale. There were plot twists and reveals. The story stands strong as a continuation of the first part.
However, as a personal opinion, I must say that I enjoyed the first part more. It offered a bit more of a sci-fi/otherworldly feeling. This second one, as richly built and all, is simply too...familiar. Too human, too Earth-like.
That being said, I am looking forward to reading the third and last book and its associated return to winter, with its cultural changes, power-shifting dynamics, and, hopefully, a distancing from the all-too-familiar Earth-like stories, populations, and developments.
Let's go, Brian, here's to not being disappointed!