Second paragraph of third story (“The Case of the Discontented Soldier”):

The major took a deep breath and abruptly plunged through the swing door leading to the outer office. A plain young woman looked up from her typewriter and glanced at him inquiringly.

A dozen Agatha Christie stories featuring London – though the main settings of individual stories can wander far beyond the suburbs and into the Home Counties. Includes some of her crazy wannabe political thriller work, notably “The Kidnapped Prime Minster”, and some particularly contrived romances, such as “The Case of the Discontented Soldier” and “The Listerdale Mystery”. But there’s some good classic mystery stuff here too, notably “Witness for the Prosecution”, and “The Case of the Caretaker”. Thanks to whoever at HerperCollins had the idea of finding and assembling all of these. You can get Capital Christie here.