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- “I'll show that fusspot Toby!”
Mavis is the tenth book in the My Thomas Story Library series.
Mavis has high-spirits which one day puts Toby in terrible danger. She soon rushes to his rescue and the pair become good friends.
- This book is based on the stories, "Mavis" and "Toby's Tightrope" from the Railway Series book, Tramway Engines.