I bought this book for my two sons aged 7 and 3. We have the other Oliver Jeffers books and have always enjoyed them. Up and down is another beautifully written and illustrated book. It features the same characters as in previous books (How to catch a star, Lost and found, A way back home) so it engages the children with the boy and penguin straight away, although if this is the first book you've read, you will understand the characters easily too. It covers the same themes, friendship, loyalty, love etc. It is a lovely book, with humorous text and beautiful illustrations and is now another bedtime favourite for my boys.