My two cents: the audio narrator changes the experience, but the order remains king. Hearing Maisie's voice age slightly, hearing the accents of new characters from different regions—it's a performance. And you can't appreciate the performance if you listen to book fifteen before book five. The narrator builds the character across decades. So, same list, but consider the audio format if you have a long commute. It turns the series into an immersive radio drama.
I have a soft spot for the middle books, like 'An Incomplete Revenge' and 'Among the Mad'. They come after she’s established but before the heaviest personal trials of the later novels. They fit into the chronology as a period of relative professional confidence, even as the world outside starts darkening. It’s a fascinating pivot point in the series timeline.
You see her methodology solidifying. Her reputation is growing. Yet, you can feel the dread of the coming 1930s crises brewing in the background. Reading them in order lets you appreciate this ‘calm before the storm’ phase. Jumping ahead to the high-stakes spy stuff would make you miss this crucial developmental stage in her career.
Library employee perspective: We just shelve them and recommend them in series number order. That's what 99% of readers want and what causes the least confusion. The few patrons who ask about 'true chronological order' are often surprised to learn there are standalones. They usually just stick to the series.
From a collector's standpoint, the difference is academic. The first editions line up on the shelf in publication order, which matches the main story progression. Any deviation is in later compiled editions or digital short story releases. For practical reading, your library or bookstore will likely have the novels numbered in publication order, which is the correct sequence. I'd only worry about integrating the shorts if I was doing a thorough re-read.
One minor critique: the later wartime books can feel a bit samey in terms of setting—lots of blackouts, bombs, and secret meetings. The historical event of the Blitz is long and grinding, and that can translate to a feeling of narrative repetition. But that might also be an accurate reflection of the wartime experience: relentless, exhausting, and defined by routine danger. It's a feature, not a bug, even if it tests the reader's stamina a bit.