It is a bright, sunny morning as Thomas pulls into the station with Annie and Clarabel. Percy was there and asks Thomas what he is doing that day. Thomas explains that he is taking some children on a tour of the island. Percy wishes he could go too and Thomas asks Percy if he can pick up Annie and Clarabel and take the children home at the end of the tour. Percy eagerly agrees.
Thomas was soon steaming across Sodor. He puffed slowly past the windmill and then past the canal. Next Thomas chuffed along the cliffs where the children saw the lighthouse. Then it was time for lunch on the beach.
By the time Percy came to pick up the children, it had started to rain. As Percy set off, the rain became heavier. When Percy approached the canal, he found that the tracks were submerged in water. He pressed on, but halfway through the flood, he could go no further. It seemed a long time before Percy heard Harold calling to him. Harold flew off to get supplies for the hungry and thirsty children.
In the meantime, Percy's driver, fireman, and guard started pulling up planks from the old brake van to re-light Percy's fire. Suddenly, Percy felt something fall on his head; Harold had dropped a parachute with a basket of sandwiches and drinks for the children and their teachers.
It was evening before Percy and the carriages struggled home. The Fat Controller praises Percy and the children give three cheers for Percy, Annie, and Clarabel.