Nancy witnesses a purse snatching and chases the thief. She manages to rescue the purse, but unfortunately, not its contents.
The owner, a doll collector, asks Nancy to do some detecting.
The woman provides a mysterious note: “The source of light will heal all ills, but a curse will follow him who takes it from the gypsies.”
Nancy interprets this clue in her quest to find an old album, a lost doll, and a missing gypsy violinist.
The girl detective’s valiant efforts bring happiness to a misunderstood child and her lonely grandmother.
In addition to sleuthing, Nancy, Bess, and George prepare for a boat race competition sponsored by the River Heights Yacht Club.