This book starts with a longish note about how Worrals is specially qualified due to speaking fluent German and French, and also has worked really hard and proved to be trustworthy (all the stealing shit and lying to her CO apparently not counting), and therefore is getting picked for special duties, rather than any of this being a normal occupation for a W.A.A.F.. Johns was asked to write these to induce young women to sign up, I suspect someone was getting letters from girls who'd found out they didn't get to fly planes, and there were next to no spy shenanigans, and were mad that this wasn't what was on the brochure.

Anyway, by this point, Worrals' CO has more or less thrown up hands, and the women are working for Definitely Not the SOE full time. Their latest mission involves establishing an air courier service to run secret messages to England from the creepiest castle in the Loire Valley. The plot then gets a bit Scooby Doo with Nazis, as there are perfectly normal explanations for all the ghost-like things happening in the castle, and the answer is always "spies." I did find the early parts of this one a little slow, as the women mostly seemed to be reacting to stuff happening to them or being helped out by mysterious forces, and our chaos goddess wasn't in effect as much, but it picked up later. Good setting if one wanted to do actual monsters or hauntings, though.

We do get some lovely moments of presumed dead in the middle, and there was only one bed! Also, it sets up a bunch of characters used in the next book, so I wouldn't skip it.