Garrison Kappa-9 was supposed to be a quiet frontier posting. Then the Swarm found it. When an alien hive intelligence sets its sights on Veridian IV, a Staff Sergeant with more sarcasm than backup has to hold a crumbling perimeter with a skeleton crew, a deadpan AI named BETTY who narrates every disaster with total indifference, and an engineer named Wrench who fixes things with duct tape, spite, and the occasional unauthorized explosive. Reinforcements are denied. The chain of command is breaking. And somewhere inside the garrison's own reactor is a secret that might matter more than the Swarm outside the walls. Part siege thriller, part dark-comedy military sci-fi, Perimeter Breach follows the last stand of a garrison nobody thought was worth saving — fought by the handful of soldiers who refuse to let it fall, one improvised, half-broken, gloriously stubborn defense at a time.