A new hardback book is just out (April) which tells the story about the 'real' Secret Army and the evasion lines which helped thousands of allied servicemen escape the Nazis throughout Europe in WW2.
It's called 'Home Run' and is written by John Nichol & Tony Rennell and published by Penguin/Viking. You'll probably find it in most bookshops.
I've not finished it yet but so far I've not come an Albert but there is a young girl who 'Yvette' could have been based on.

