Sometimes books become too popular for their own good and here we have two books that would fall into that category.
Treasure Island is full of "cliches" (the thing is, this is original, but you heard it so many times in popular culture, it is has become cliche when you finally read it).
Still, a plot is good, a story isn't too long and there is a reason why "pirate" genre is so popular, it is a fun adventure.
About Dr. Jekyll and Mister Hyde...
No mystery.
You know they are one and the same person, so no surprise at all, but the story is classic and it is really short.
Really nothing else to say about it.
Overall deserving grade 4.