Jay-Jay and Jumbo uncover gold and gold thieves in this jolly, entertaining mystery. When some mysterious strangers begin searching for gold in the Long Island village, Jay-Jay decides to investigate. A notebook, a code, Robbers' Rock and ""Rob's Rock"", a capture in a boat and at last an iron pot of gold and the capture of several unpleasant characters make an exciting adventure, with boats, salt spray and seagulls in attendance. The gold turns out to be the gold of Captain Brown's grandfather, left for the Captain, and the adventure closes with a grand lobster dinner at the Captain's home with the two boys, their friends and State Troopers eating and singing. This is good fun from start to finish.