The residents of 21 Bradhurst are up in arms. Someone has been overturning the trashcans, smashing out the lightbulbs, and plunging the six-story building into darkness. Bobby and Sonny are accused of these dastardly deeds. To prove their innocence the boys set out to catch the culprit(s) and clear their names. The Newcomer continues the Bobby and Sonny Mystery Series in which these two amateur sleuths set out to solve mysteries in their Harlem community.