As Halloween approaches, 12 year old Clodagh is certain she saw a grey horse in the woods around the manor house. Are these the ghosts of Lilly and her horse Veillantif, which local legend says return to haunt the manor each year during Halloween? But with one of the local horses gone missing in mysterious circumstances, and a spooky Halloween party to organise for Mrs. Fitz, are Clodagh and her much loved Connemara pony Ozzie really seeing ghosts...