This is more or less just an extension of Huckleberry Finn with Huck and Tom involved in a murder case at Tom's Aunt Sally's place in Arkansas. Mark Twain penned this novella about ten years later but its setting is only a year or two after they break Jim out at Aunt Sally's.
This is a children's edition so I shouldn't have been too surprised certain offensive words beginning with 'N' are changed to 'Negroe'. I suppose this is better than one well intentioned publisher who raised a storm of controversy a couple years ago by changing the offending word in a new edition of Huckleberry Finn to 'slave'. But the word was considered normal in Twain's day and the terrible scourge of slavery won't be undone by editing classic literature.
This is a fun little story, told from Huck's perspective and certainly appropriate for young and old alike, even with (or perhaps because of?) the editing