The little boy visited me a lot . After the mother died of a heart attack and the little boy went to live with older siblings , a young woman named Amy lived in that apartment . On the first floor lived an older African - American couple . For security there was a deadbolt on the front door to the building .

Question: What may be the reason for the dead bolt ?
Answer: There have been multiple murders in the area .They live in an unsafe neighborhood .Their residents are paranoid .They live in a safe neighborhood .