What is the exposition of summer of fear by Lois Duncan?

The exposition of "Summer of Fear" by Lois Duncan introduces readers to the main characters, including the protagonist, Rachel Bryant. It sets the stage by establishing the Bryant family's peaceful life in New Mexico before a mysterious cousin named Julia arrives, bringing tension and unease with her. The exposition also hints at Julia's sinister intentions and the escalating sense of dread that will unfold throughout the story.