After his mom dies, PJ reluctantly leaves his New York home and everyone he loves, to live with his Aunt Katie in Edinburgh. A series of strange events begin when his aunt’s elderly neighbour and her cat Azrael convince him that his mom, weirdly, is still very much with him.

At a bereavement counselling group, PJ makes a new group of friends, all of whom have lost loved ones. Drawn together by their shared experiences, they soon discover they have something else in common; an interest in the supernatural. Freya is the daughter of a white witch, Sunny has a scientific and enquiring mind and Shuggie, a superfan of ghost hunting programmes. Led by PJ, they try to prove that there is life after death and that their loved ones are still with them. The team receives strange messages leading them to investigate Greyfriars Kirkyard where they experience terrifying paranormal activity and PJ is drawn into the clutches of the evil Mackenzie Poltergeist after reciting a famous rhyme that invites the restless spirit to draw back the bolt of his scary mausoleum to allow him entry. There, he finds himself in a fight of good against evil with the ghost of Sir George Mackenzie.