Margery Allingham 
Pearls Before Swine [EPUB ebook] 

The man and the woman carried the body cautiously up the stairs. Although it was still early evening, the narrow way was grey and shadowy, and it was very cold, colder even than it had been outside amid the thin traffic of a wartime London.
The two who were alive in that grim little group which writhed and breathed so hard in the gloom were both elderly people. They were an unexpected couple in any situation; the man was a large, blank-faced Cockney without any pretensions and the woman was out of place beside him, her delicate aristocratic grace accentuating both his clumsiness and the horror of her present task.