On a distant Earth colony, an orphaned survivor of an alien invasion discovers that the greatest world-ending dangers aren’t behind her. It’s been eight years since an alien invasion drove a small surviving group of settlers to seek refuge in an underground shelter. Cut off from the rest of humanity, the ragtag band has maintained a narrowly functioning colony due to communal effort and salvage runs. Alex Archer has her own duties as a dog handler. While this off-world colony may be harsh, Ash, Alex’s black shepherd raised to sense threats, makes living in it a little nicer. But the tenuous hide-and-seek with the monstrous species known as the Lankies is about to come to an end for Alex and her close-knit crew of soldiers, techs, and friends. When a salvage operation goes catastrophically wrong, the Lankies home in on the humans. With hopes of a rescue long faded, all Alex has left is will—and the fear that there’s so much more to lose.

In this explosive conclusion to the Frontlines series, Special Operations soldier Alex Archer must lead her elite team on an impossible rescue mission—deep into alien territory where one mistake means extinction for humanity. When a fellow team’s distress call breaks through from deep in Lanky territory, Alex knows this could be her deadliest mission yet. The aliens are evolving, developing an uncanny ability to anticipate human tactics, and their latest adaptations are nothing like what Special Ops trained for. When a distress signal from deep in enemy territory reaches Alex’s team, they face a continue with their own mission or break the rules and mount a rescue attempt across dangerous ground, on a world where the environment is as deadly as the alien enemy. With advanced recon tech and cutting-edge tactical gear, the Badger Dogs take the fight to the Lankies on their own turf. As they battle the odds and a ticking mission timer, every shadow could hide a lethal threat. One wrong move could doom them all. This pulse-pounding conclusion to the acclaimed Evolution series delivers high-stakes military action and a final test of human courage against an enemy that’s learning to think like its prey.