The Blue Boa is the third book in Jenny Nimmo's Children of the Red King series. Charlie Bone is back at Bloors Academy, and again involved in a mystery. In this book he is trying to find an invisible boy, and make him visible. He also need to rescue his Uncle Paton from the evil influence of a shape changing monster. With the help of his friends at school and lots animals, will he suceed? A very enjoyable read, will leave you eager to read the next in the series.