A strange message, attached to the leg of a wounded homing pigeon, involves Nancy in a dangerous mission.
Before beginning her investigation, Nancy is contacted by a local physician who had been kidnapped to treat an elderly woman held prisoner in a country mansion.
The doctor furnishes a valuable clue—a bracelet to which the woman has a matching necklace.
Nancy is determined to find and free the captured woman.
Following the bracelet and carrier pigeon clues, she locates a mysterious retreat and a ruthless ring of swindlers.
Nancy undertakes a risky masquerade to save helpless elderly women.