In this chapter, Christopher Boone, a 15-year-old boy with autism, discovers the lifeless body of Wellington, the neighbor's dog, lying on the grass. The sight of the dead dog deeply disturbs him, and he experiences a surge of emotions that he struggles to comprehend. His initial reaction is one of shock and confusion; he cannot understand why someone would harm a dog, which he sees as innocent and unthreatening.

Despite the unsettling nature of the event, Christopher feels compelled to investigate the circumstances surrounding Wellington's death. He recalls his father's strict warnings about staying out of other people's business, but the sheer injustice of the situation propels him to take action. Christopher's sense of logic and order drives his decision; he believes that solving this mystery will provide him with answers and a sense of control in a world that often feels chaotic.

As he grapples with the social implications of his investigation, Christopher reflects on his unique perspective and how it affects his interactions with others. He is acutely aware of his differences and often feels isolated from the people around him. His thought process is methodical; he decides to document his findings in a book, mirroring the style of detective stories that he admires. This meta-narrative aspect allows readers to see how he structures his thoughts and observations, reinforcing his logical mindset.

Christopher's determination to uncover the truth begins to take shape in this chapter. He recalls important details about Wellington and his owner, Mrs. Shears, which lays the groundwork for the investigation. His cognitive approach to the situation highlights his analytical skills, as he contemplates variables, potential suspects, and motives. The chapter ends on a note of intrigue, with Christopher resolutely stating his intention to solve the mystery of Wellington's death, showcasing his courageous spirit amidst the emotional turmoil.

Overall, Chapter 2 serves as a crucial turning point for Christopher, as it marks the beginning of his journey into the complexities of social relationships and the mysteries of human nature, all while remaining true to his character's logical framework. This chapter not only sets the plot in motion but also deepens the reader's understanding of Christopher's perspective, emphasizing themes of curiosity, isolation, and the quest for truth.