When Pat Jacobs father dies she is sent to live with her Uncle Tom and Aunt Madge. Tom has a security job that is highly secret. Pat of his job is training alsatians for security purposes. He agrees to let Pat train a dog named Gem. One night Gem alerts Pat to a group of suspicious men near the house. Pat tries to investigate further the next day but the tyre marks are gone.
- Mystery on the Moors – Judy: 424 (24 February 1968) – (?)