Tony can hardly believe it. He's sailing with the wind, maneuvering through the narrow channels between the offshore islands with amazing skill. And he'sjust learned to sail! But suddenly Tony is confused. Which way had he come? Which way is he headed? And who are the mysterious couple with the high powered motor boat who are to busy searching beneath the water to answer his call for help?

Tony does some searching on his own. What he discovers leads him on a daring hunt for a 200-year-old shipwreck . . . and a dangerous confrontation with treasure hunters who will stop at nothing to keep Tony from learning their secret.

While learning to sail during a visit to his grandmother's at the Connecticut shore, eleven-year-old Tony becomes excited about the rumors of sunken treasure in the area and starts following a couple who seem to be making a mysterious search for something.