The Balloon Tree - Phoebe Gilman

I use to love reading this book when i was little. I remember my mum bought it for me and i use to read it over and over..

About the book:

When Princess Leora's father leaves the castle, he tells her if anything goes wrong to release balloons from the castle tower as a warning to him. While he's away, her evil uncle, the Archduke, makes himself king. What's worse, he pops every balloon in the kingdom. Princess Leora must find at least one balloon to save the kingdom!