The Hardy Boys are on the case in the second installment of the thrilling amateur detective series. Brothers Frank and Joe Hardy join their detective father in surveillance of an old mansion on the cliffs overlooking Barmet Bay. After being frightened away by a scream, the boys return to investigate the allegedly haunted mansion and discover a connection to their father's smuggling case. When their father vanishes, they must search the caves beneath the house and confront the smugglers there. The adventure, mystery, and excitement of the Hardy Boys series have captivated readers for nearly a century and continue to do so today.