Zane Grey 
Day of the Beast 

When WW1 soldier Darren Lane returns home, he’s shocked by what he finds. Underage drinking, jazz music, gambling; all signs that the Roaring Twenties are just around the corner. But where some see liberation, Darren sees only a dangerous moral decline. And he want to put a stop to it. Fuelled by the pain of his war experiences, Darren’s righteous cause mutates into violent vigilantism. Zane Grey is best known for his Westerns, but with "The Day of the Beast" he creates an insightful portrait of post-war depression and illness. Reading like a precursor to "Taxi Driver", it holds a unique place in his bibliography. A novel well worth exploring for any Grey fans. —