Bunkle, Robin and Jill help their father, who is in the British Secret Service, to round up a German spy in Devonshire.
The story begins with Bunkle throwing a cushion at an old lady, and the cushion bursts.
Later, Bunkle sees some very curious things through a crack in the floor of his attic bedroom.
- Format: Paperback
- Pages: 200 pages, line
- Publisher: Fidra Books Ltd
- Publication Date: 23/03/2007
- Category: Classic
- ISBN: 9781906123017