Fallen Empire (JF Holmes) Books in Order

The Fallen Empire books are military space opera set after the collapse of a huge alien power. The war is over, at least on paper, but peace has not made life simpler. Old borders are shaky, supply lines are broken, veterans are out of work, and the worlds caught in the demilitarized zones are still full of people with guns, grudges, and unfinished business.

That broken aftermath is the whole point.

The first book, The Irish Brigade, follows Captain Iona Keely, a former Terran Union Marine who leaves the service with a degree, a record, and not much idea what comes next. She winds up commanding Bravo Company of the Irish Brigade, a private military outfit working contracts in a dangerous frontier where governments, companies, and local factions all want protection. Holmes uses her story to set the tone for the series. This is a world where mercenary work is not glamour. It is payroll, logistics, politics, blood, and trying to keep people alive when everyone has a different definition of winning.

The setting matters a lot. The Grausian Empire has fallen, but its collapse has not made the galaxy cleaner or kinder. Instead it has left power vacuums everywhere. Former subject races, human factions, local rulers, criminals, and surviving imperial interests all push into the gap. That gives the books a rough frontier feel, even though the stage is interstellar. Space stations, DMZ worlds, civil wars, and battered armored vehicles all fit together in a universe that feels lived in rather than shiny.

Overrun widens the lens. Instead of sticking to one frontline unit, it uses multiple linked stories to show what this new order looks like from different angles. You see mercenaries trapped in civil wars, investigators hunting war criminals, tank crews trying to break sieges, and veterans learning that the end of one war only makes room for the next. That broader view is a big part of the appeal. Fallen Empire is not just about one hero. It is about a whole political and military ecosystem that keeps generating fresh trouble.

The tone is practical, tactical, and a little weary. Holmes clearly likes the details of unit life, but the books are not only about firefights. They are also about chain of command, prejudice, loyalty, class, and what happens when people trained for war have to build new identities in the ruins of empire. Human characters share the page with aliens who are not just window dressing, which gives the series some extra texture, especially when old imperial hierarchies are still shaping personal relationships.

If you like shared-universe military fiction, this is the draw. Each entry adds another corner of the map, another company, another mission, another piece of history. The battles matter, but so does the larger question hanging over all of it, which is what kind of order comes after a long age of conquest finally falls apart.