Mr. Shivers by Robert Jackson Bennett

Set during the Great Depression, the story follows Marcus Connelly, a grief-stricken man on a relentless quest for vengeance against a mysterious, scarred figure known as Mr. Shivers, who he believes is responsible for his daughter's murder. As Connelly travels across the desolate American landscape, he joins forces with a group of similarly afflicted wanderers, each driven by their own thirst for retribution. Their journey becomes increasingly perilous as they encounter supernatural elements and the true nature of Mr. Shivers is gradually revealed, blurring the lines between myth and reality. The novel explores themes of loss, obsession, and the haunting power of grief, set against a backdrop of a nation grappling with its own despair.