When Frank and Joe Hardy discover mysterious footprints under their window, they're launched into a dangerous web of smugglers and spies. A mysterious visitor vanishes in the night, their father's papers are stolen, and a sinister Chinaman lurks in the shadows. Can the Hardy Boys untangle the clues before they become the next victims? The Hardy brothers find themselves investigating a complex smuggling operation involving Orrin North and the sinister Louie Fong after a stranger using a false name disappears from their home. As Frank and Joe uncover secret passages, hidden trap-doors and cryptic Chinese messages, they realize their father Fenton Hardy may have been manipulated by criminals. With their aunt drugged, a frightened Chinese man in need of protection, and their own lives in danger, the Hardy Boys must use all their detective skills to break the case before the smugglers can silence them permanently.RetryClaude can make mistakes. Please double-check responses.