The Hidden Harbor Mystery

The Hardy boys meet Mr. Bart Worth who is the editor of the Larchmont Record. He explains that Mr. Samuel Blackstone has sued him for printing a story accusing his ancestors of being pirates. Mr. Worth also tells the Hardy boys about the long-standing feud between the Blackstone and the Rand families over ownership of a pond in Larchmont.
The Hardy boys accept Mr. Worth’s case and, along with their friend Chet Morton, drive to Georgia. Once they have set up a camp on the beach between the two properties, the boys begin to investigate the Rand and Blackstone estates. They are surprised to find a ‘sea monster’ in the pond and to witness Mr. Rand being hit over the head with a vase by Mr. Blackstone, only moments later to find the vase intact and Mr. Rand missing. They also discover that the disputed pond had in the 19th century been a harbor (the Hidden Harbor of the title) used by pirates before a hurricane cut off its access to the ocean.
Despite the efforts of their enemies, the Hardy boys manage to find Mr. Rand and recover a treasure chest containing historical records which prove that the accusations Mr. Worth made in his article were all true. The feud is settled when Mr. Rand and Mr. Blackstone decide to work together to harvest the valuable cypress trees from Hidden Harbor.