When Will finds himself in hospital, but unable to make anyone see or hear him, he realises that he never made it home from his first date with the school hottie. Knocked off his bike in a road traffic accident, Will is now officially dead - and a ghost. But somehow his best mate, Dougie, can still see him, and, once they've exhausted all the comic possibilities of being invisible, they decide to delve into the truth behind a school rumour - whether there really is an unhappy spirit haunting the ruins in the school grounds, and if so, why? What they discover is a long-buried mystery, which stretches its fingers right into the present...