Nameless Detective Series / Shackles / Bill Pronzini

When Nameless’s detective is kidnapped one winter night near his home in San Francisco, he is driven to a remote mountain cabin and left chained in a leg iron with only enough supplies for three or four months: his masked captor has planned a slow and vengeful death. Nameless survives the loneliness and physical deprivation and, with a great effort of will, sets out to find and free his would-be killer.