When a shadow auction begins selling NATO’s secrets, a disavowed operative and his ragged team must hijack a moving AI fortress. High-tech, high-risk, and morally raw — this is espionage at the end of the line.

Ethan Keller was a weapon pointed at America’s enemies — until he chose a life over an operation, and the cost was measured in body bags. Now, running on borrowed loyalty he tracks the fallout of that choice across Europe: a weaponized AI called Snowglass is mapping NATO’s blind spots, and the people auctioning its output don’t care which side of a border burns.

With a codebreaker who sees what no one else can, a soldier whose trust he hasn’t earned, and a handler who may still be pulling strings, Ethan has one shot — board a moving command car, upload a kill package, and destroy Snowglass before it reshapes the global order. But every step closer forces the question he’s spent years running from: how many lives can one man compromise to save the ones in front of him?

If you love morally complex protagonists, high-stakes tradecraft, and the emotional wreckage of impossible choices, The Black Stone will grip you from the first page.