I finished it, its OK. I can't give it more than that, but I tried to. David Adams writes this story with energy and conviction. Lacuna: Demons of the Void is space opera through and through.
Spoilers below!
Here's where things fall flat for me however. The main character makes decisions that commit the entire human race to a war of extinction with a powerful alliance of aliens. Let me set that up. At first they come and bloody our nose and say 'stop developing THAT technology' (they don't say what it is). To which we apparently say 'screw that noise' and build SPACE BATTLESHIPS! Earth makes a whopping 3 of them, none of which are any upgrade on what we already saw from the aliens. One her shakedown cruise, our intrepid captain spots an alien scout ship which makes absolutely NO hostile move. What does she do? She attacks full bore, damn the torpedoes. No hailing, no negotiations, no 'let us see what their intentions are first, we have them outgunned', nothing, just ATTAAAAAACK!
Her first officer begs her not to, he's a douchebag though--screw him, ATTAAAACK!
I kept waiting for something to be revealed that shows the reader that this was the best and only course of action, a bit of info that the captain knew that we just were not privy to yet. No, quite the opposite, she fishes out a surviving alien and hey, guess what? She's a sweetheart. Perfectly sane. Not a warmongering alien.
Now admittedly we can look at the initial attacks the aliens made on earth as murderous acts. They made no attempt at diplomacy or any of that stuff either. They caught us with our pants down and wiped out three major world cities to tell us to stop developing some technology and they were obscure about just what technology they meant. It's a stretch for me to believe we would take the fight to them at such an early stage of the game. We had provocation, but I would think we would have more sense than to attack when we had just barely gotten our feet wet. What would it have hurt to talk first now that we had slightly better footing than initially? Because the scout would get away? Ummm, so? Like an intelligent alien race isn't gonna no their scout ship didn't come back? Were they suppose to assume it got eaten by space pirates?
So our captain catapults us into full on war with alien race of which we have no clue of their size, full military might, or their technological level.
She captures an alien and talks to her, now she KNOWS that they are more advanced, more numerous and have an extensive empire. She also learns just what tech they didn't want us to develop and HEY guess what? They have a really good reason to make us cease and desist and it really is for our own good. The jump drive of the space ships to go from point A to B has a nasty tendency to make planet eating black holes. They actually wanted to stop us from killing ourselves. They just had no idea how to do that in a civilized manner. Wait. No, they tried it many times before and it never worked. I guess bombing three cities of a races homeworld must work to make them stop, right?
OK so now we know that the alien alliance is also horrible at diplomacy, but they have us so outgunned its not even funny. Maybe its not too late, we can talk to them about this, surely. No, screw that noise, lets take out three SPACE BATTLESHIPS, none of which are any better than any of the alien's ships, and attack their main fortified military base. Yeah let's do that, show them we mean business.
See where I am going with all this? Are we as humans that nasty, or that foolish?
Lastly I want to hit on something else that bugged me: The ships representing Earth are all made by and piloted by diverse races, nations, and cultures. Check, I love that idea. Wait. Never does this major piece of background ever affect the decisions, motivations, or any other characterizations of the players in this drama. They pay little more than lip service to their cultural backgrounds, to me they all read as just plain, white-bread Earthlings. I would go so far as to say they were just Americans for all that it made any difference to their characterizations.
And apparently, while we are not pulling triggers on nuclear launch devices, learning alien language, hacking alien tech, or repairing hull breeches, we just screw.
In the end we do get so see that the aliens are indeed horrible and savage and very nasty, but only in the end, and at that point, they are acting just like us.
Sorry I could not rate this any higher, I know the author wrote this with passion, but there are just too many motivational and strategic holes with the plot. Too many missed opportunities to take race, culture, and nation into consideration. I can't speak for the military discipline aboard ship, or lack thereof, but there sure seemed to be a lack. The biggest battles are told, not shown. I didn't put it down though, I read it through. He gives us that, its quite readable. So I ended up with just OK despite my laundry list of issues.