em>s a thrilling mystery novel in the iconic Hardy Boys series, written by Franklin W. Dixon. In this captivating story, Frank and Joe Hardy, along with their friends Chet Morton and Biff Hooper, find themselves embroiled in a puzzling case involving the disappearance of their chums. As the young detectives follow a trail of clues and face dangerous adversaries, readers are taken on a suspenseful journey filled with intrigue, suspense, and unexpected twists. Join the Hardy Boys as they use their wit, courage, and resourcefulness to unravel the mystery and bring their missing friends back home safely.