Frank and Joe Hardy are determined to bring to justice the vicious criminals who kidnapped their detective father while he was investigation sabotage of a road-building project in the Kentucky wilderness.
The trail leads them to New York City but ends abruptly in a cemetery With the new clue of a Spiral symbol the Boys head to Kentucky as part of a highway construction crew to track down the kidnappers and saboteurs..
Hardy\'s escape, the two young sleuths are spurred into action when he mumbles the word Felix and they discover a dossier of a notorious ex-convict was stolen from his files.
After Mr.
Frank and Joe Hardy are determined to bring to justice the vicious criminals who kidnapped their detective father while he was investigation sabotage of a road-building project in the Kentucky wilderness
