Follow Opal on a treasure hunt through the science museum to find her birthday surprise. As Opal and her friends open each clue, readers will have the chance to guess the answers, which are hidden at the bottom of each page. Children can test their scientific knowledge and learn something new with each clue as Opal gets closer to her birthday surprise. With colorful illustrations and easy-to-read font, readers will have a fun reading experience as they join Opal to the end of her treasure hunt.
