How was the story of Boo radley and the trial of tom robinson brouth together at the of to kill a mocking bird?

Right after Tom Robinson is convicted, Bob Ewell is in a bad way. Although the jury convicted Tom, they certainly did not believe Mayella. The jury just could not take a Negro's word over a white girl's word even if the girl is a Ewell. The whole town knows the truth and Bob Ewell feels humiliated. Bob blames Atticus and goes after the only people he can scare. He attacks Scout and Jem which brings out the reclusive Boo Radley as their savior. Thus the Tom Robinson story and the Radley story come together. The two gentle mockingbirds (Boo and Tom) give meaning to the title of the book.