In a city that sells stolen memories, one detective is losing himself.
Detective Jax Callahan has spent weeks staking out the darkest corners of a near-future city where human memories, skills, and entire identities can be extracted, bottled, and injected like a drug. They call them echoes. For the desperate, they promise a shortcut to a better life. For the dead turning up in alleys across the city, they were the last purchase ever made. Someone is flooding the streets with unstable echo cocktails, combinations so volatile they tear a person's mind apart from the inside. And the bodies are piling up.
The investigation pulls Callahan toward NeuroTrace Technologies, the corporation that turned a cure for Alzheimer's into a billion-dollar black market empire built on harvested lives. But the deeper he digs, the more the case twists back toward an unsolved murder he was never allowed to investigate. Worse still, some of the echoes are changing. Becoming aware. Fighting to survive inside the minds of their hosts. The victims thought they were making an ordinary purchase. They had no idea the product was fighting back.
In a world where anyone's memories can be stolen and sold, Callahan must decide how far he'll go to stop the people profiting from it. But when the line between justice and obsession blurs, and the truth demands more than he's willing to pay, one question remains: can you solve a case that might cost you everything you are?