When you launch the app, you will see the "bookshelf". There you can choose between the available books, by clicking on them. To change language, press the flags at the top.
When you're in a book, change page by clicking in the bottom left or right corner, when you first enter a book two animated arrows will show you where to click to change page.
The books contain large images and supports zoom (pinch and double-tap) to let you and your child explore the books and the little details in the background, close up.
Some images are clickable. For example, the answers to the riddles of Fox in The Adventure With The Missing Chocolate. Clicking the right answer shows a green box with encouraging text.