Final answer:
Christopher reacts with profound betrayal and shock upon learning that his dad lied about his mother being dead, leading to a pivotal moment of emotional turmoil in the story.
Step-by-step explanation:
When Christopher discovers that his dad lied about his mom being dead, he experiences a profound sense of betrayal and shock. This moment represents a pivotal point in the narrative where his trust in his father is shattered. The lie shakes the very foundation of his world, leading to intense emotional turmoil.
In many stories that explore similar themes of parental betrayal, characters often undergo significant stress and their sense of reality is distorted. They might react with anger, grief, or confusion, and their further actions can significantly impact the direction of the story.