Jon Ryan was supposed to be decommissioned. He’s two billion years past that appointment, his right arm is in an alien’s satchel, and the galaxy he just woke up in is owned by an empire called the Adamant that has never lost a war. He has no allies, barely enough power to keep his android body running, and a grudge the size of the known universe. Embers is Book 1 of Craig Robertson’s Galaxy on Fire series — military space opera at full throttle, with a protagonist who responds to impossible odds by asking whether the universe has a complaints department.

The Adamant know his name. That’s the first sign things have gone wrong for them.

In the outer sectors of the galaxy, prisoners are being tortured for information about a single rogue android. Their torturers — the Adamant’s finest Inquisitors — are methodical, efficient, and increasingly alarmed by what they’re hearing. Jon Ryan has been busy. He’s made allies in species the Adamant considered broken. He’s acquired shapeshifter partners the empire can’t track. And he’s operating with the kind of cheerful disregard for his own survival that no Adamant military doctrine has a procedure for.

While the empire’s internal politics grind through blame and denial — the Grand Inquisitor trying to make sense of intelligence reports that suggest an actual rebellion is forming — Jon Ryan is doing exactly what he said he would: making the Adamant pay attention.

The problem with paying attention to Jon Ryan is that it tends to cost you something.

Flames is Book 2 of the Galaxy on Fire series. The spark is real. The galaxy is starting to notice. And Jon Ryan, for the first time in two billion years, is beginning to feel like himself again.

The empire convenes. The android doesn’t wait.

In the chamber of the High Adamant Domination Council — a room designed to amplify the emperor’s voice and remind everyone else of their place — something unprecedented is happening. A single rogue entity has forced a session. Jon Ryan, android, rebel, and the most improbable military threat in galactic history, has graduated from a minor irritant to a line item on the imperial agenda.

The council debates. The emperor fumes. The Inquisitors compete for credit and argue about jurisdiction. The bureaucracy of evil does what it always does: it generates paperwork and punishes messengers.

Meanwhile, Jon Ryan is not at the table. He’s in the field, hitting targets while the empire is looking at a map. He has allies drawn from species the Adamant broke and discarded. He has technology scavenged from the empire’s own abandoned installations. And he has the one thing the Adamant’s entire military doctrine never prepared for: someone who genuinely doesn’t care how many of them there are.

Firestorm is Book 3 of the Galaxy on Fire series. The Adamant are taking Jon seriously now. That’s not going to help them.

Jon Ryan is sitting at a bar in the least respectable drinking establishment in the galaxy, nursing something that might be whiskey and thinking very carefully. He’s been known to make deals. The question is always whether he can get out of them on his terms. The Adamant Emperor — vain, distracted, and surrounded by incompetent subordinates — is about to have his overconfidence weaponized against him. Jon is the weapon. Fires of Hell is Book 4 of Craig Robertson’s Galaxy on Fire series — politics, negotiation, and the careful art of making promises to people who can kill you.

The Adamant Secure Council meets to discuss an intelligence report that has frightened their most senior analyst. The council Prime dismisses it. That is the last mistake he will be positioned to make.

The report describes something the Adamant empire has never encountered in its long history of conquest: enslaved species actively cooperating. Sharing intelligence. Coordinating. Preparing, ahead of an Adamant advance, as if they know it’s coming. The analyst believes this represents an unprecedented threat. The council believes the analyst is being dramatic.

Jon Ryan has been very busy.

The rebellion he started with nothing now spans sectors. The Deavoriath and their abilities have become something the Adamant cannot track or predict. Jon has found allies in places the empire never thought to watch, and he has done something even more dangerous than building an army: he has given enslaved species a reason to believe.

Dragon fire, in the old human sense, was the kind of flame that consumed everything in its path and couldn’t be put out. What Jon Ryan has built in five books is exactly that — and the Adamant are about to watch it arrive.

Dragon Fire is Book 5 of the Galaxy on Fire series. Believe in magic. It’s the only explanation the Adamant have left.

The galaxy is changing. The Adamant are retreating. An android who woke up alone and unarmed two billion years ago is finishing what he started.

Across the outer sectors, species who lived their entire lives under Adamant rule are testing new freedoms with the tentative wonder of creatures who don’t entirely believe the danger has passed. And they’re right not to be entirely sure — because the Adamant, whatever their losses, are not finished. They are restructuring. Regrouping. Still capable of savage reprisals against the species that dared to hope.

Jon Ryan knows this. He has been fighting long enough to understand that an empire built over millennia doesn’t disappear in a clean moment of victory. It has to be finished. Systematically. Thoroughly. With the kind of stubborn, comprehensive attention to detail that only an immortal android with a very long grudge can bring to the project.

But finishing a war costs things. It costs pieces of Jon that don’t grow back. It costs time he’s already spent more of than any human ever should. And it costs him the reckoning he’s been putting off — the accounting of everything he’s done, everyone he’s been, and whether the galaxy that emerges from the ashes is the one he would have chosen if he’d had the choice two billion years ago.

Ashes is the final book of the Galaxy on Fire series. The fire has burned. Now comes the quiet, and everything Jon Ryan has to figure out what to do with it.