A series of unfortunate events, The bad beginning by Lemony Snicket
The bad beginning is the story about Baudelaire siblings (Violet, Klaus and Sunny) who are suddenly orphaned, by a fire at their house. They are sent to live with Count Olaf who is there closet living relative who is a foul and evil man who is only after the Baudelaire fortune.
I loved the way this book was written, Snicket uses developing langue in places and to take the reader with him explains the meaning of the word and phrases. He continues to use the words which have been introduced to reinforce them throughout the book. I think for a gifted child in KS2 this book would be a good read for them to read to themselves also a good read to the whole class as well.