In a future where humanity has conquered mortality, Dr. Isabella Moretti, a renowned exo-archaeologist dedicated to deciphering the secrets of extinct civilizations, faces an unwelcome "Second Life" of compulsory service. Thrust into the Aegis Legion, the Concord's shield against frontier perils, she's deployed to the desolate Erebus System at galaxy's far edge —a place besieged by the Phantoms, an unseen, merciless alien force whose motives are unknown. With colonial outposts systematically obliterated by devastating kinetic strikes from orbit, Isa and her newly formed platoon, Void Watch, must learn to survive an enemy that offers no battle, only silent, relentless annihilation.

As the Legion struggles merely to endure, Isa’s archaeologist’s mind, trained to find patterns in cosmic whispers, begins to perceive a chilling logic within the chaos of destruction. The Phantoms' attacks aren't random; they follow complex mathematical sequences, a terrifying calculus governing their campaign of erasure. Tasked with understanding why these specific long-dead colonial sites warrant such meticulous attention, Isa must delve into a cosmic enigma that challenges humanity's most fundamental understanding of life and intelligence in the universe. The answers lie hidden in the patterns of annihilation, but uncovering them may reveal a truth more vast and unsettling than anyone dares to imagine, redefining humanity's place on the shores of an infinite cosmic ocean.