Extinction Horizon meets Contagion in this sequel to 2025's sci-fi thriller Symbiote, where the biological threat has escaped the South Pole and is now wreaking havoc upon Antarctica.

The survivors of the South Pole massacre will find that getting off the Antarctic continent may cost them their lives…

Months after the events of Symbiote, sunrise has come to the ice continent, bringing with it the beginning of the annual tourist season. where 1,500 summer visitors will soon call the coastal McMurdo Station home. With them are the architects of the classified CIA program that unleashed the deadly microbes, who are determined to uncover what happened with their experiment and harvest samples of the mutation to turn into a biological weapon.

However, when Ben Jacobs returns from an impossible journey to the Pole and is reunited with Penny - an asymptomatic carrier of the symbiotic microbes - all hell breaks loose. When the sea ice surrounding the station becomes a fertile breeding ground for a new and more dangerous infestation, Rajan Chariya and his friends will have to join forces with the CIA to fight the onslaught of infected "sea people" roving the streets. With tensions high and stakes even higher, the question becomes when will the group stop being useful, and start becoming targets who know too much?

Worse, there may be more than one asymptomatic carrier….

With a heart-stopping pace and twists that will leave readers breathless, Sentient is a thrilling sequel that brilliantly combines all the best horror tropes with real world scenarios.

My Review:

When I read Symbiote, the first book in what is now called the Ice Plague Wars series, back in late 2024, the very first scary thing in the story was that it takes place in 2028 as the U.S. and China are on the brink of World War III. Yes, that’s a THREE, in a story that was only four years out at the time.

I finished this second book, Sentient, in late 2025, when that prospect was only three years away, and as you read this review near its publication date in early 2026, it will only be two years in the future. A future that is so close – and in some frightening ways so very plausible – that it’s easy to see that future as the most frightening of the horrors outlined in the story – whether the war happens or not.

But this book, at least so far, is MOSTLY an alternative future – which doesn’t make it any less chilling and not just because of its setting at the frozen bottom of the world.

Which is thawing a bit – as much as Antarctica ever does – when this story picks up the action just a few desperate months after the fraught and bloody ending of Symbiote. Because summer, such as it is, is about to arrive at the isolated South Pole Station but also at the much more populated – and totally unprepared – McMurdo Station, along with the annual migration of the summer science and engineering crews.

Even more frightening, this year’s visitors include representatives of the architects of the ice plague that ravaged South Pole Station and is heading straight for McMurdo. From both directions.

The few survivors of the plague-induced massacre at South Pole don’t know that they are harboring the plague in their midst. The station crew at McMurdo don’t know that the CIA strike team heading their way is tasked with cleaning up the plague that the CIA scientists seeded among the international overwinter crews. A plague that has mutated so much and so fast that their only option to eradicate the plague and all the evidence about its origin may be to scorch a continent that has never seen anything like this much fire – even if they have to take themselves out along with the plague.

Everyone on the frozen continent is out for their own survival. Even the penguins. And none of them may – or perhaps should – get out of this alive. Which won’t stop all of them from trying.

Escape Rating A+: Sentient is every single bit as much of a WOW as the first book, Symbiote. It’s also a lot of the same kind of compelling but alarming, terrifying and horrifying (and I need more descriptive words because this series so far needs ALL of them) as the first. Please don’t mistake me, it’s not that this second book is the same as the first, rather that it is similarly spine-chilling only more so because the situation is just so much worse – and sinking fast.

(The first book I stopped reading at 1 am because I knew I wouldn’t sleep if I didn’t. This time I woke up at 6 am (I am NOT a morning person) because I couldn’t stop thinking about it and HAD to finish immediately.)

This second book, and the series as a whole, is definitely one of those “book in a blender” situations – starting with even more ice as the base ingredient. Then I’d throw in Michael Crichton, Robin Cook and Nicholas Sainsbury Smith for the engineered plague, extinction-level bioterrorism, utterly FUBAR’d military snafu cover up along with Tom Clancy and M.L. Buchman for the political thriller/terrorism shenanigans complete with hitting entirely too close to a possibly all-too-real terrible future.

Because, this also needs an even bigger heaping helping of that terrible classic combo, the quote from Jurassic Park that warns “Your scientists were so preoccupied with whether or not they could, they didn’t stop to think if they should,” along with the much older and even truer quote from Walt Kelly’s Pogo, “We have met the enemy and he is us.”

By this time in the story, everyone we meet is part of that “us”, in one way or another. Regardless of how innocent they might have been when the saga began or how long they managed to ignore just how terrible the situation had already become.

The story here, between the bioterrorism, the political cover-up, and the shooting war that has already begun, has a lot more thriller/horror facets than it does science fiction. Which doesn’t lower the sheer, compulsive, utterly chilling readability of the thing one big. Or degree whether measured in Fahrenheit or Celsius.

Every single character has been stripped down to their basest survival instincts, and it’s just as chilling observing their individual veneers of ‘civilization’ break down as it is watching their bosses, handlers and overlords not just watching them suffer but practically ordering their deaths.

And yet, just as “it’s not over until it’s over”, the story of the Ice Plague Wars doesn’t end at the end of Sentient. It merely opens a new, wider and even more terrifying AND horrifying front in this conflict. I expect to see the iceberg on the book’s cover turn completely red as blood when the even more chilling third book in this series looms over the horizon.

World War III rages, and the scientists at the South Pole are thankful for the isolation – until a group of Chinese scientists arrive at the American research base with a dead man in their truck. The potential for a geopolitical firestorm is great, and, with no clear jurisdiction, the Americans don’t know what to do. But they soon realize the Chinese scientists have brought far more with them than the body…
Within seventy-two hours, thirteen others lie dead in the snow, murdered in acts of madness and superhuman strength. An extremophile parasite from the truck, triggered by severe cold, is spreading by touch. With rescue impossible for months, it is learning from them. Evolving. It triggers violent tendencies in the winter crew, and, more insidiously… The beginnings of a strange symbiotic telepathy.
From an exciting new voice comes this propulsive SF-thriller, infused with authentic details about life in one of the world’s harshest, most mysterious landscapes, Antarctica.

My Review:

Four years from now – just think about that for a minute. Four years from right NOW. The world is on the brink of World War III.

And that’s not necessarily the most frightening part of the story!

The fears and frights and scares and outright terrors are layered in this OMG DEBUT novel, to the point where the reader’s heart is pounding alongside all the rest of the characters. I say ‘rest’ of the characters because frankly, if this is that close then we’re already in it and it’s already all of us.

But those layers of fear may start with just thinking about how close this might be, but the part of the story that grabs the reader by the throat and doesn’t let go is the part that happens far, far away, in the remotest place on Earth.

Over an entirely too short 72 hours in the midst of the long Antarctic winter, the tiny overwinter crew at Amundsen-Scott South Pole Station is reduced from 41 scientists, technicians and support crew to just FIVE scarred and scared survivors after the station is invaded.

In the midst of the Third World War that is happening in the world at large, the crew at the U.S. controlled South Pole fears that the vehicle heading their way from the Chinese-controlled Dome A is the vanguard of that invasion.

And it is – but not in the way that anyone thinks. It’s not the three starving Chinese men who are the threat – it’s the dead man in the back, the one who dashed himself against the walls until he died.

He had a passenger. (Technically, the dead man had a host of passengers.) In the best SF horror thriller tradition, those passengers, a lab experiment gone much too successfully and entirely too wrong, have plans of their own.

Escape Rating A+: There are so many ways to think/talk/write about Symbiote – and they ALL work. The whole thing was a WOW. (Admittedly, a WOW I had to stop reading at 1 am, even though I had less than an hour left. I could have finished. And I’d probably have been awake for the rest of the night as a result. It’s that kind of WOW.)

The horrors, as I said, are layered. There’s the World War III aspect, which is touched on just enough to give the reader the shivers, which then gets subsumed in all the other horrors, only to rear its ugly head again at the end.

Underneath the World War III scares and the political maneuverings that go with it is the horror so brilliantly pointed out in the first Jurassic Park movie, “Your scientists were so preoccupied with whether or not they could, they didn’t stop to think if they should.” The results are not actually dissimilar, although part of the horror leans a bit on another famous, and much older quote from Walt Kelly’s Pogo, “We have met the enemy and he is us.”

One of the biggest, and most in the moment layers of the horrors in Symbiote is very definitely the human equation.

The small crew of overwinter “polies” is, as they are every year, alternately hard working and bored, often introverted but stuck in the enforced intimacy of a VERY TINY small town, isolated from the whole entire rest of the world and quite possibly just a bit – or a lot – cracked in one way or another.

There’s also a deep, resentful divide between the scientists – the ‘beakers’, and the techs and support crew – the ‘loggers’. On top of that there’s a huge gender imbalance, three men for every woman. It’s a pressure cooker on multiple axes and the stew gets aside to cook for a nine-month season. It’s not really a surprise that it boils over at the best of times – which this particular overwinter absolutely is not.

In other words, the story in Symbiote had more than enough stress factors to go to the ‘dark side’ from the human parts of the equation alone. And to some extent those human factors continue to drive events even after not all the humans are exactly still or just merely human.

And it’s those human factors that give the story its compulsive, breakneck pace. Because it’s the humans that we care about – and we do. We absolutely do. From the beginning, when it just seems like the scares come from humans just being human and some of them being shitty humans, we already have our hero, our sidekicks and most definitely our villains.

As the snow gets deeper and the shit gets WAY more complicated, so do the motivations of ALL the players – and the reader gets even more invested as each character learns something new and shitty about themselves – and stands or folds under the weight of that knowledge.

I got so caught up in this story I barely stopped to sleep while I still could. When I finished, I found the ending cathartic enough – and yet still open. Because it reads like this chapter may be done, but there is plenty of story yet to come.

As there should be. Because the survivors have merely managed to survive the horror they faced in their isolated base. The huge, horrifying issues that brought this mess to their snowy doorstep are out in the wider world – and have yet to be addressed. Even though one of those messes already clearly has plans to address them.