"The Secret of the Lost River Canyon" by Harry Castlemon is an exciting adventure book filled with mystery, danger and incredible discoveries. The main character finds himself in the center of the mysterious disappearance of people in a strange canyon, where every step hides a new threat. Together with him, you plunge into the world of adventure, risk and desperate search for the truth. Read "The Secret of the Lost River Canyon" and feel the atmosphere of the unknown that awaits you behind every page.