The second exciting installment in Enid Blyton's Adventure seriesWhy is everyone so afraid of the castle on the hill, and what dark secrets lurk inside its walls? Philip, Dinah, Lucy-Ann, Jack, and Kiki the parrot are on holiday in the countryside, staying on the side of Castle Hill. When flashing lights are seen in a distant tower, they decide to investigate--and discover a very sinister plot concealed within its hidden rooms and gloomy underground passages.
- ISBN10 0330335707
- ISBN13 9780330335706
- Publish Date 10 June 1994 (first published February 1968)
- Publish Status Unknown
- Out of Print 20 June 2002
- Publish Country GB
- Publisher Pan Macmillan
- Imprint Macmillan Children's Books
- Format Paperback
- Pages 112
- Language English