The Spy Who Sat and Waited

If you've read them all (Folletts books) and like the genre, theres a not as well known book, written around the same time as EOTN named 'The Spy Who Sat and Waited' by R. Wright Campbell. Its similar as far as the German spy with a love interest etc., but its set in WWI and in the Orkney Islands. I LOVE(D) this book ! Yeah, its out of print but I have seen it on eBay and used on Amazon. If you get the chance, grab it, you will not be disappointed !

*No I'm not the author, no connection to the author, no financial interest/gain etc etc. - just wanted to give a heads up to other fans of the genre.