ISBN: 0340038179.
4th book in Secret Seven series.
Blue cloth-covered boards.
Dark blue decoration on covers.
Light wear to edges of dustwrapper.
Some faint spotting to edges of page block.
Contents clean.
Very good condition with dust-wrapper.

ISBN: 0340042125.
4th book in Secret Seven series.
Paperback.
95 pages.
Covers worn.
Pages tanned.
Good condition.

ISBN: 0340042125.
4th book in Secret Seven series.
Paperback.
95 pages.
Covers worn and creased.
Name on title page.
Ticks against list of other titles.
Pages tanned.
Reading condition.

ISBN: 0340042125.
4th book in Secret Seven series.
Paperback.
Light wear to covers.
Good condition.

ISBN: 9780340680940.
4th book in Secret Seven series.
Paperback.
Light wear to edges of covers.
Very good condition.