My name is Lin Chen. At twenty, I stunned the industry with my groundbreaking AI robot designs—people called me a homegrown Tony Stark. Back then I had a perfect family: my wife Shen Wan was a top AI ethicist and the light of my life, and we were the model couple everyone envied. I believed in science and was always saying that everything could be explained by it. But when I was thirty, a car accident took Shen Wan, and the police ruled it an accident. Since then I quit my job at a leading tech company and went into hiding on the outskirts of the city, opening an unremarkable machine repair shop and living in self-imposed exile—until I learned that the crash was never an accident at all.