As the other educator has already addressed the climax of the story, I will address the resolution of the story.
The resolution occurs when Brent meets the artist in Maine. There, he finally makes peace with his past, acknowledges his humanity, and begins to look hopefully to the future. In the last chapter of the book, Brent stops at Weeksboro. At the beach, he chances upon an artist who is painting a crab shell.
Brent fashions the last of his four whirligigs and mounts it at the top of a hill where the artist lives. The two then begin a conversation about Brent's past. During the conversation, the artist tells Brent not to give up on life, and she reassures him of his worth. Upon hearing her words, Brent has an epiphany. It suddenly dawns on him that his past actions do not define him eternally and that he has many opportunities to do good with the life that he has. This moment of realization is a powerful one, resolving the story on a hopeful note.