When the book was released, reviewers noted that it was divided into two parts, and opinion was mixed about Lee's ability to connect them.  The first part of the novel concerns the children's fascination with Boo Radley and their feelings of safety and comfort in the neighborhood.  Reviewers were generally charmed by Scout and Jem's observations of their quirky neighbors.  One writer was so impressed by Lee's detailed explanations of the people of Maycomb that he categorized the book as Southern romantic regionalism.  This sentimentalism can be seen in Lee's representation of the Southern caste system to explain almost every character's behavior in the novel. Scout's Aunt Alexandra attributes Maycomb's inhabitants' faults and advantages to genealogy (families that have gambling streaks and drinking streaks), and the narrator sets the action and characters amid a finely detailed background of the Finch family history and the history of Maycomb.  This regionalist theme is further reflected in Mayella Ewell's apparent powerlessness to admit her advances toward Tom Robinson, and Scout's definition of "fine folks" being people with good sense who do the best they can with what they have.  The South itself, with its traditions and taboos, seems to drive the plot more than the characters.The second part of the novel deals with what book reviewer Harding LeMay termed "the spirit-corroding shame of the civilized white Southerner in the treatment of the Negro". In the years following its release, many reviewers considered To Kill a Mockingbird a novel primarily concerned with race relations. Claudia Durst Johnson considers it "reasonable to believe" that the novel was shaped by two events involving racial issues in Alabama: Rosa Parks' refusal to yield her seat on a city bus to a white person, which sparked the 1955 Montgomery Bus Boycott, and the 1956 riots at the University of Alabama after Autherine Lucy and Polly Myers were admitted (Myers eventually withdrew her application and Lucy was expelled, but reinstated in 1980). In writing about the historical context of the novel's construction, two other literary scholars remark: "To Kill a Mockingbird was written and published amidst the most significant and conflict-ridden social change in the South since the Civil War and Reconstruction. Inevitably, despite its mid-1930s setting, the story told from the perspective of the 1950s voices the conflicts, tensions, and fears induced by this transition."Scholar Patrick Chura, who suggests Emmett Till was a model for Tom Robinson, enumerates the injustices endured by the fictional Tom that Till also faced. Chura notes the icon of the black rapist causing harm to the representation of the "mythologized vulnerable and sacred Southern womanhood". Any transgressions by black males that merely hinted at sexual contact with white females during the time the novel was set often resulted in a punishment of death for the accused. Tom Robinson's trial was juried by poor white farmers who convicted him despite overwhelming evidence of his innocence, as more educated and moderate white townspeople supported the jury's decision. Furthermore, the victim of racial injustice in To Kill a Mockingbird was physically impaired, which made him unable to commit the act he was accused of, but also crippled him in other ways. Roslyn Siegel includes Tom Robinson as an example of the recurring motif among white Southern writers of the black man as "stupid, pathetic, defenseless, and dependent upon the fair dealing of the whites, rather than his own intelligence to save him". Although Tom is spared from being lynched, he is killed with excessive violence during an attempted escape from prison, being shot seventeen times.

Question: How many parts was the book divided into?
Answer: two parts