The Mystery of the Masked Rider

[1] While appearing under the Carolyn Keene house pseudonym, it was written by Alison Hart.

Cover legend: "Revenge rides a dark horse – and Nancy's the target!"

The prize-winning filly is worth a cool $200,000 and that kind of cash can breed plenty of greed, ambition and danger.

Soon Nancy has her hands full trying to stop the mysterious culprit, the Masked Rider, who wants to kill Nightingale.

This article about a mystery novel for children first published in the 1990s is a stub.