Andrew Lang's series of fairy-tale books are some of the fundamental children's reading of the twentieth and late nineteenth century. The stories are not "original" there's no such thing when they were almost without exception passed down orally; but they are in old, not very modernized tellings. Many readers who have only seen or read modern, Disney-fied versions of Cinderella, Sleeping Beauty or Snow-White will not recognize some of the darker twists in these tales. For example, in Sleeping Beauty, when the Prince wakes the Princess and marries her, the story is by no means over. The Prince's mother is an Ogress, whom his father married for her wealth, and it's suspected that she likes to eat little children; that "whenever she saw little children passing by, she had all the difficulty in the world to avoid falling upon them." The happy couple have two children, named Day and Morning, and the Ogress decides to dine on them one day when the Prince is away. Yes, it still has a happy ending, but Disney it isn't. The only thing that might have to be explained to a child is the occasional use of vocabulary that is no longer current. Most often this is the use of "thee" and "thou"; but a few other words will crop up. However, they're usually inferable from context, and the stories are marvellous entertainment regardless.