Worrals, in the course of not doing her job, begins to suspect one of the other pilots is a spy, and gets up to all sorts of shit trying prove it. As with the pervious novel, she does exactly one ferry flight, before spending the rest of the book involved in spy shenanigans in France. No, her CO does not know she's gone to France. However, the pure chaos the woman leaves in her wake draws the attention of Definitely Not the SOE, and we're off to the races. I really enjoy how the books hit a balance of the characters being quietly competent at all times, while still showing their feelings and natural distress at accidental spy shenanigans in France. There's a lot of snappy dialogue that mostly comes across as humour to cover distress, and that they're eighteen, and the weight of a world war hasn't yet sunk in.

Oh, this book decides to make the flirting between Worrals and a male pilot an open romance, but it takes up so little page time I'm just pretending it's not a thing.