This is almost a very good book. Somehow it falls short. There's new material here-with the early glass-making industry of the Cape as a new angle -- and good Massachusetts coast atmosphere soon after whaling days had become chiefly a memory. Kit, a youth staying with his old aunt to escape a smallpox epidemic, decides to explore the whys and wherefores of Danger Cove, a mysteriously threatening harbor where ships are rammed by an unknown force. The curious activities of Kit's explorations are now impeded, now advanced by the curious activities of a young artist. The characters are out of the ordinary -- and while the plot development is erratic, there is enough here to make it above average as supplementary reading for school libraries.