[General thoughts]
https://bookshop.org/beta-search?keywords=rex+stout&bkshp-astro=t
Rex Stout's Nero Wolfe mysteries were written at the same time as Christie's novels.
Wolfe is a sedentary iconoclast who seldom leaves his Manhattan townhouse. Instead he sends Archie Goodwin out to follow up on clues and bring home witnesses to be interrogated.