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Goodreads asked Ralph E. Vaughan:

Who is your favorite fictional couple, and why?

Ralph E. Vaughan It's a good question, especially if you read mysteries, as do I. Despite the fact that being a detective is often a lonely profession (see Marlowe, Spade and Bosch), a great many couples inhabit mystery novels. If you define couple as married, then I'd have to opt for Nick and Nora Charles and Mr & Mrs North. If you extend it out to couples who should be married, I'd include Hildegard Withers and Inspector Oscar Piper in the mix as well. Loosely defining a "couple" as two people working together, one thinks of Holmes and Watson, Poirot and Hastings and Goodwin & Wolfe. Looking at a modern series, I cannot not leave out Christopher Fowler's detectives Bryant & May, London's oldest detectives who began their career during WW2 and are still at it.

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