Thomas is not happy that James is collecting the flour for the cakes to be had at a children’s party. Thomas is so cross that he is stuck shunting trucks instead, he bangs James’ flour truck hard, which causes the door to fly open, resulting in all the flour pouring out! Thomas goes to get a replacement flour truck but by the time he reaches the mill, it is shut. But there is one last hope: There is another truck full of flour – behind a whole lot of empty ones.