Just finished reading, and the plot of 'The Impostor' is basically about a mid-level banker, Adam, who fakes his own death after a fraud scheme at work blows up. But instead of disappearing cleanly, he gets roped into this underground witness protection-adjacent program that's basically a criminal enterprise itself. They give him a new identity as a quiet academic, and the irony is he has to pretend to be a moral philosophy professor while being completely morally bankrupt.
What hooked me wasn't the crime thriller stuff so much as the psychological toll. He's living in this small college town, teaching ethics seminars about authenticity, and he's constantly terrified someone from his old life will recognize his mannerisms. The paranoia scenes where he thinks a random student's question is a coded message are genuinely unsettling. It all spirals when a real investigator, not from the police but from the bank's internal security, starts poking around the town. The book becomes a cat-and-mouse game, but the mouse is also being hunted by the people who supposedly saved him. The ending leaves you wondering if his entire new personality is just another layer of the con.