The body of a disgraced college lecturer is found on an abandoned railway line. In the four years since his dismissal for sexual misconduct, he’d been living like a hermit. So where did he get the 5,000 pounds found in his pocket?

Leading the investigation, Detective Chief Inspector Alan Banks begins to suspect that the victim's past may be connected to his death. Forty years ago the dead man attended a university that was a hotbed of militant protest and divisive, bitter politics. And as the seasoned detective well knows, some grudges are never forgotten—or forgiven.

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