You can access free ebook versions of different class novels by visiting www.librariesni.org.uk.
There are lots of other titles available to read. Here are some suggestions of books you might enjoy.
AnneFine "The Diary of a Killer Cat"
"The Angel of Nitshill Road"
Michael Morpurgo "War Horse"
"Adolphus Tips"
"Born to Run"
Roald Dahl "Matilda"
"Charlie and the Chocolate Factory"
"James and the Giant Peach"
"George's Marvellous Medicine"
Jeff Kinney "Diary of a Wimpy kid" Series of books
C.S. Lewis "The Lion the Witch and the Wardrobe"