Bill Edwards, orphaned in the early years of the war, is sent to France to help the resistance effort. When he arrives, he discovers his mission isn't what he thought it would be.
This wasn't as good as Moxham's The Mystery of Smugglers Cove
as it lacked narrative structure. The characters run around without much thought or planning, and are constantly surprised by things that, when read in context, they should probably have thought of. I put this down to the fact that the story originally ran as a serial in the old-fashioned style, which needed to end with a surprise and cliffhanger of about the same level of drama each time. This might make it quite suitable for a bedtime read to a pre-teen audience.
In the end I didn't really enjoy the book, as instead of experiencing building tension, I started instead to simply roll my eyes and think 'duh' every time the characters were stymied again. Also, Bill seemed to possess a number of unaccountable skills - engine repair, aircraft flight (including emergency landing and aerial combat!) - that started to feel contrived.
If you want a boys-own-adventure style novel about escaping from behind enemy lines during the war, I recommend Ian Serraillier's There's No Escape
instead, which (for all its unconscious racism) stands up to adult re-reading.
Most of the errors mentioned in another review have been corrected in the version I read, so if you are put off the book on that grounds, you needn't worry.
* I was given a free copy for review purposes.