What do you want to say about the story? What aspects of it do you wish to write at length on? Once you’ve decided on that then your thesis statement will tell the reader what they’re in for when they read the entire essay. It’s like a summary or synopsis of the main points and as the definition goes, will answer the questions posed in the essay.

The hardest part of the thesis statement is having to have written the essay before you can write it. You really have to know exactly what you intend to say or to argue in your essay before you can summarize it.

I don’t know the novel but and example thesis sentence about a character that changes could be.

During his lifetime Eliezer evolved form a foolish boy to a man of great wisdom.

OR:

Eliezer’s character evolved over time. Some of these changes were the result of a trajic life.