The book "Rancher Boys; or, Solving the Mystery of the Diamond X Ranch" is written by Willard F. Baker. This is an exciting adventure about a group of young guys who live on the "Diamond X" ranch and find themselves in a cool mystery investigation. After they come across mysterious events, they will have to do their best to solve the mystery. Readers travel with the rancher boys across the prairie, where incredible challenges, danger and true friendship await them. This book is full of adventure, plot twists and interesting characters that will capture the hearts of young readers and leave a lasting impression on anyone who loves exciting literature. "Rancher boys; or, Solving the mystery at the "Diamond X" ranch" is a book that will amaze with its dynamics and unexpected turns of events.