Benjamin January travels to Vicksburg to aid a wounded conductor on the Underground Railroad. When the local station’s leading organiser is murdered, coordinator Jubal Cain is accused but cannot defend himself without exposing the network of safe houses and the fugitives it protects.
January investigates among plantation owners, enslaved workers, abolitionists and people who profit by capturing escapees. Every question risks revealing the route north, and the case forces him to confront compromises made by those who resist slavery while determining who killed the conductor and why.