Math
These numbers can only be divided evenly by 1 and themselves. Christopher uses them to organize the chapters.
What are prime numbers?
Christopher struggles to understand this word, which describes caring deeply for someone.
What is love?
Christopher calls himself this because he investigates who killed Wellington.
What is a detective?
Christopher finds these in his father’s room and learns the truth about his mother.
What are letters?
Christopher must navigate this busy public space to travel to London.
What is a train station?
A branch of math dealing with shapes, angles, and measurements, often visual.
What is geometry?
A feeling of unease or worry that Christopher experiences in new or crowded places.
What is anxiety?
This word refers to something that gives you a hint about the answer to a mystery.
What is a clue?
A way of sharing thoughts without words, such as facial expressions or gestures.
What is nonverbal communication?
The city where Christopher discovers the truth about his mother.
What is London?
A repeated design or sequence that Christopher loves to find in the world.
What is a pattern?
This word means the ability to understand and share someone else’s feelings, which is hard for Christopher.
What is empathy?
Christopher uses this term to describe his logical process of figuring things out.
What is deduction?
Christopher uses this term to describe how he organizes information to explain his ideas visually.
What is a diagram?
Christopher draws one of these to help him find his way to the train station.
What is a map?
Christopher uses this term to describe how he solves problems step by step.
What is logic?
Christopher reacts this way when things don’t follow his expectations or routine.
What is frustration?
Christopher keeps detailed notes about his observations and findings in this.
What is a book?
The word for a story someone writes to share their personal experiences, like Christopher’s book.
What is a memoir?
This word describes Christopher’s journey to a new place to find answers.
What is an adventure?
This kind of math puzzle or game challenges your brain to think in new ways.
What is a brainteaser?
A feeling of being unsafe or at risk, often experienced when Christopher faces uncertainty.
What is vulnerability?
This term means a sudden realization that solves a problem or mystery.
What is a breakthrough?
A breakdown in understanding between two people, often leading to conflict.
What is a misunderstanding?
A word for traveling on your own without help, something Christopher accomplishes.
What is independence?