There are lot of good books for children available. The whole series of 'Diary of Wimpy Kid' are very interesting. Kids of ages 5-12yrs find these very interesting. My daughter has a collection of these books and she likes reading again and again.
I really love 'Diary of Wimpy Kid' The book is easy to read and the illustration make it more catchy for the kids. Really interesting books and good way to improve vocab. I have all the series of the book.
I find secret seven books very interesting and intriguing. My son is a fan of secret seven. Actually he loves mystery. Diary of wimpy kid is also nice book but I believe it is for younger kids, while secret seven caters to a vast age group.