No witchcraft for sale

I had a very hard time understanding this story. Actually I think I didn´t understand it. It begins saying that the little sweet boy was used to see black servants people in his house. In theory, he didn’t have the example of the racist people. But as the time goes by, he gets to be racist and treats bad Gideon, his cook. One day, Teddy, the little master gets hurt. And in that point, the story changes completely. There, the story changes completely. Neither more Teddy nor the resolution of any problem is next. The introduction drives to any point to understand the story. Then, Gideon uses a strange plant to cure the little child. The parents are fascinated and they have a hard time trying to convince Gideon to show the world the marvelous plant. Gideon never gives them the true plant. I just couldn’t understand the plot line that the author followed to write the story. Maybe he wrote like that on purpose.