Burnett's granddaughter, Lily Stone, is visiting her grandfather. She meets a dog named Mutt at the railway station. Lily meets Mr. Conductor's cousin Junior and Stacy Jones before she is taken to Burnett's house. Mr. Conductor calls his cousin, Mr. C. Junior, to help him with his gold dust crisis. That night, Percy and Thomas conclude there is a secret railway between Sodor and Shining Time. After spying on their conversation, Diesel 10 goes to the smelters yard to tell Splatter and Dodge of his plans to destroy Lady. Observing this, Toby distracts Diesel 10 by ringing his bell, causing Diesel 10 to knock one of the supports out from the shed with his claw, which collapses the roof on top of them. The next morning, Thomas collects six coal trucks for Henry, and one of them accidentally rolls through the buffers that lead to the secret railway. Later that day, Mr. Conductor is abducted by Diesel 10, who threatens to drop him off a viaduct unless he divulges the location of the buffers, but Mr. Conductor cuts one of the claw's hydraulic hoses with a pair of tin snips, and is thrown free. He lands at the Sodor windmill, where he finds a clue to the source of the gold dust.