The Ghost of Obdiah Buttonhole

Teenage adventure story for the young adult where a small group of young motorcycle enthusiasts become involved with a treasure trove hidden and guarded by the ghost of a friendly, hanged highwayman. However they are not the only ones involved, as two villainous factions are after it also, which leads to intrigue, kidnapping breakneck motorcycle escapes and a possible murder as they struggle to save it from being plundered.