'The Call of the Canyon' is a novel by Zane Grey. It is the story of Glenn Kilbourne, a US Army veteran, who returns from the battlefields of World War I "shell-shocked and gassed", and otherwise incapacitated". It is set in the American West of the Roaring Twenties. Meanwhile his fiancée, Carley Bruch, lives with her family in New York. She receives communication through letters from Gleen but little by little these letters become more and more strange. The young woman worries about him and decides to go visit him.