Emily and Sophie age 9, and Jack age 8, organise the perfect Mothers Day picnic at the beach at Blackthorn Bay. Later that evening as the sun sets, everyone gathers around the campfire to tell ghost stories. Unexpectedly, they hear about the legend of the Blackthorn ghost - a boy who is said to haunt Blackthorn school every year at graduation time.

When strange things start to happen at school as they get ready for graduation - Sophie starts to suspect that the graduation ghost is actually real!

Can the Blackthorn Stables gang, along with their ponies and dog Benji, figure out what is going on? Is there really a graduation ghost in Blackthorn school? Join Emily, Sophie, Jack and friends in this heart-pounding May adventure as they navigate spooky clues and discover the true meaning of teamwork, courage and friendship in this charming graduation themed book.