My Catholic Faith by Louis LaRavoire Morrow is my all time favorite. It is simple reading with true stories, anecdotes, illustrations, quotes from scriptures, and pictures included. For those who find reading instructional books tedious, this book is so beautifully written that you won't lose interest at all. Every Catholic should have a copy.
You can find the book on Amazon. (Don't forget to click on the Amazon link on the top or bottom of Cathinfo. page so that ChantCD can get a commission from your purchase)