The Hidden Harbor Mystery - Franklin W. Dixon

The Hardy Boys once again have jumped into the thick of a complicated mystery.\n \n Samuel Blackstone and his cousin,\n Professor Ruel Rand,\n live on adjacent properties,\n and it appears that they may be out to hurt each other because they have both been attacked.\n Frank and Joe soon learn that a treasure is rumored to be hidden in or near the pond between the two properties.\n They investigate and learn that others are involved in the dangerous animosities too.\n \n Spooky mansions,\n secret passages and rooms,\n mysterious characters,\n and a monster provide the ingredients for enjoyable reading!\n