Reddit reviews London Calling North Pole

An interesting exception to the pattern is the Netherlands. The entire British network was infiltrated and then subsequently run by the Germans.

You can read the German side of this story in London Calling North Pole by the guy who ran the German side: Hermann Giskes.

You can also read part of the British side in Between Silk And Cyanide, which are the memoirs of the SOE codemaker who worked out that the Germans must have been running the agents.

Many questions are not answered there, though, such as: why did the British keep the network intact even when they knew it must be blown? Why did they continue dropping agents and equipment directly to the Germans?

I am unsure if these really count as proper historical sources, though, so sorry if this doesn't technically count as a proper top-level answer.