To Dust Return by Michael Newton
TWO SURVIVORS INTENT ON REVENGE
A retired Texas Ranger tracks a family-annihilating serial killer across the midwestern Dust Owl in 1935, seeking revenge for his family's murder and other related slayings.
Wallace Mahan seeks to avenge his family's murders while racing against time with a diagnosis of congestive heart failure. Companion Rose Halliday survived the slaughter of her parents and brother in Kansas, joining Mahan in his quest for vengeance after he frees her from custody as a victim of false arrest.