On a trip to visit their grandparents during the school holidays, Ben and Ella discover that their grandfather, Pappy, had been keeping a secret from them. To the children's total shock and amazement, he was friends with a dragon - a cloud dragon called Agondray! Little did they know that this revelation would change their lives forever and take them on an adventure they would never forget: traveling to Cloud Land with Agondray in a desperate attempt to save the city and those Agondray cared most about.