This book (as well as the whole Narnia series) is a fantasy story that is appropriate for children. Both children and adults can benefit from reading this book, however.
In a line: Eustace learns that other people really do exist. In depth: Lucy and Edmund return to Narnia, bringing their irritable (and irritating) cousin Eustace with them. During their journey to the Utter East, they all learn lessons in greed, selfishness and pride. Symbolism: The transformation of Eustace parallels the "rebirth" of unbelievers when they accept God's judgement and Jesus' salvation.
"Oh, Aslan," said she, "it was kind of you to come."
"I have been here all the time," said he, "but you have just made me visible."
"Aslan!" said Lucy almost a little reproachfully. "Don't make fun of me. As if anything I could do would make you visible!"
"It did," said Aslan. "Do you think I wouldn't obey my own rules?" --Lucy and Aslan after Lucy has uttered the spell to make invisible things visible
"Shall I ever be able to read that story again; the one I couldn't remember? Will you tell it to me, Aslan? Oh do, do, do."
"Indeed, yes, I will tell it to you for years and years." --Lucy and Aslan on the spell "for the refreshment of the spirit"
"Please, Aslan," said Lucy, "what do you call soon?"
"I call all times soon," said Aslan.
Lucy could only say, "It would break your heart."
"Why," said I, "was it so sad?"
"Sad!! No," said Lucy.
"What!" said Edmund. "Is there a way into Aslan's country from our world too?"
"There is a way into my country from all the worlds," said the Lamb; but as he spoke, his snowy white flushed into tawny gold and his size changed and he was Aslan himself, towering above them and scattering light from his mane.
"Oh, Aslan," said Lucy. "Will you tell us how to get into your country from our world?"
"I shall be telling you all the time," said Aslan.