Every new novel from Jennifer Mills is a fascinating puzzle, gorgeously rendered and emotionally rich. While all the pieces are there, in plain sight, from the moment you open the first page, they reveal their picture gradually, with precision and grace.

In The Airways those pieces created a haunting exploration of gender, violence and embodiment; in Dyschronia, a surreal eulogy to time, the truth and the world as we know it.

Review: Salvage - Jennifer Mills (Picador)

In Salvage, these pieces combine into a near future struggling to adjust to the consequences of a warmed world. Rising sea levels and severe weather have led to mass-migration, social instability and the renegotiation of power and economic structures.

In the midst of all of these sweeping destabilisations, people are just trying to get by. The rich search for ways to escape any real hardship, while the poor salvage what they can. Family remains family, as supportive and problematic as they have always been.

Jude knows all of this intimately. As a child, she was orphaned by the Endurance eco-disaster and adopted ("rescued") by JB Prince, head of Prince Industries, whose mines were responsible for poisoning her town (although nothing, of course, was proven). When JB died in suspicious circumstances, she was effectively raised by his surviving daughter, Jude's older adoptive sister, Celeste.

Celeste, for all her wealth and sophistication, was fragile. She kept them both locked away in Sovereign House, her family's estate, isolated from the protesters, the desert and the death throes of Australian society. Celeste clung to her younger sister tightly, an anchor in rough seas. When given the opportunity to escape this dying world on the Endeavour, an experimental space station for the ultra-rich, Celeste took it. Jude refused to join her.

So when the Endeavour failed, and fell burning from the sky, it took the last of Jude's family with it.

Now she lives and works in Northport, a salvage station in the backwaters of the Freelands. She drives a truck, sometimes full of supplies, sometimes with refugees. She's left Australia behind, tried her hand at various jobs and various relationships, but refuses to let herself be tied down by either. She carefully avoids any interaction with the authoritarian Alliance, struggles to get a good night's sleep, and tells no one about her past.

But then an escape pod is salvaged and brought to Northport. Impossibly, its inhabitant is still alive. Despite the years and the changes both have undergone, Jude recognises her. Suddenly, she is forced to weigh up the life of isolation and anonymity she has built for herself with responsibility for a family she thought long gone.

Salvage opens as Jude attempts to leave Northport, alone, in the pre-dawn dark, because "Celeste is her problem: the risk should be hers alone". We don't, at this point, have any idea who Celeste is, what she means to Jude and why she might be a problem. But none of that matters. The important part here is Jude is determined to do this difficult thing all on her own, but a small selection of friends refuse to let her.

Jude tries so hard to avoid any real connection with other people, but despite her attempts at isolation, she's managed to create a little found family in Northport. Most definitely against her better judgement.

This is not the first time Jude's up and left a place that might, if she's not careful, become something of a home. She has experience in this area. The book begins with the heart-wrenching line: "Everything you carry bears the weight of what you're leaving." Jude travels light. She knows if she carried all the homes and the families, the friends and lovers, or even the passing acquaintances she has been forced to leave behind, she'd be so overburdened she wouldn't be able to move. She wouldn't be free.

And freedom is everything to Jude.

As Salvage unfolds, we follow three woven threads, three timelines, that reveal how we got here - why Jude is the way she is, what Celeste means to her, and the weight of her decision to risk everything for her long-abandoned, long-lost sister.

Present timeline Jude helps refugees create a new life in the Freelands. Living in the Freelands means sacrificing comfort, technology and decent health care. But it also allows you to escape surveillance, make your own choices and live your own way. Past Jude finds herself rebelling against the life JB so generously "gave" her, contained as it is within the boundaries of Sovereign House, and from the demands of her sister's overbearing love.

For her part, Celeste searches for a way to leave the world behind. While it ultimately leads her to Endeavour's hallucinogenic orbit, this longing has plagued her entire life. If she could have willed herself to disappear much earlier, and if she hadn't had Jude to care for, she would have.

All three threads ask: what are we willing to sacrifice for freedom? Is it worth the price?

And on that note, what about our responsibilities? It's all well and good to run away, but what do we owe the people we leave behind? Our family, society. The planet itself.

In Salvage, Mills builds a vivid image of this climate-collapsing world, through small details and larger, cataclysmic events. Wars and resource scarcity, authoritarian regimes and desperate billionaires, refugees struggling to survive against the rising "hungry" sea. We are given snippets of history. It's never the full story, but it's all we need to build a picture.

With the Alliance and the Freelands we see two sides of the same future. They're both disturbingly realistic visions that sometimes feel a little too close to home.

On one side, we see a population scraping by in the rubbish left by previous generations. It's a life built on community, on recycling the old into the new, on relying less on technology and being more attuned to nature. On the other, we're shown a world of advanced technology, controlled by an authoritarian government. Walls and checkpoints, surveillance and robots.

Together, they remind us the world to come will not be any more homogenous than the one we have now. There will be haves and have-nots, comfort and poverty. Resistance and progress, however you might define these things.

I hesitate to call this future "dead", "dying", or even "a post climate-change" world. Because that change is not over yet. In fact, it probably won't ever stop. There is no end date when things will go back to the way they used to be, where it would theoretically have been safe for Celeste and the other inhabitants of the Endeavour to return.

You can't run away from consequences, in other words. No matter how far you fly.

Beautiful and devastating, heartbreaking and life affirming, Salvage is not a fast puzzle to solve. Jude reveals herself slowly, begrudgingly, and Celeste remains aloof - but that only makes it all the more rewarding once you start to get to know them.

There are no surprise twists in this book, no grand reveals, more a quiet feeling of inevitability. As the picture begins to resolve itself, you realise you've always known what it looks like.

What you're here for, what makes this such an engaging novel, is Jude herself. Her resistance to the comfortable prison that was her life in Sovereign House, the hard-learned skills she built as she learned to survive, the refugees she helps in the Freelands, and the careful distance she places between herself and the people who keep trying to get to know her.

When that escape pod washes up and cracks the shield she's built around her heart, we want her to let its inhabitant in. To trust in a little bit of human connection. Because even when the future's hard, we have to face it. But we don't have to do it alone.