Dagobert and Jane Brown make a charming couple - and a very readable pair of sleuths. Here are links to some reviews (and further information) about some other detective couples whom you might enjoy:
Jeff and Haila Troy, created by the husband and wife writing team of Audrey and William Roos, writing as Kelley Roos: The Frightened Stiff:
Moving is never fun. Especially if you’re a young couple moving into a basement apartment in New York’s Greenwich Village in the 1940s…only to discover your furniture isn’t there yet, there’s no lock on the door, no shades on the street-level windows, strange things going on in your apartment building…and the police wake you to tell you there’s a corpse out in your garden that seems to have been drowned in your bathtub.
Then there are Henry and Emily Bryce, created by Margaret Scherf. I enjoyed Glass on the Stairs:
Take what appeared to be an open-and-shut case of suicide. Stir in a few clues that don't add up - a pink glove, some possibly poisoned toothpaste, a few sounds that should have been on a tape recording that somehow weren't there, and a few shards of broken glass. And let Emily and Henry Bryce shake up the mix - because, as Emily observes, “When we have a murder, we don’t like to be piggish about it. We want all our friends to share it with us.” What you have is a rather remarkable screwball comedy-mystery called Glass on the Stairs, by Margaret Scherf.
Another husband-and-wife writing team, Frances and Richard Lockridge, came up with an extremely popular couple of detectives in the mid-twentieth century: Pam and Jerry North. They're rather hard to find now, but there's a Kindle edition available of The Dishonest Murderer:
The Dishonest Murderer surely reflects a peculiar way of looking at a violent crime such as murder, right? And yet here's a case in which the entire setting of the murder - from its victim, to the method of murder, to the setting where the body was found - all seemed wrong. It was up to Pam North to sum it up, quite well: “we’re looking for someone dishonest. A dishonest murderer…a setup designed to mislead. Dust in our eyes. In other words, a kind of sleight of hand. So that we’d look in the wrong place. Fundamentally dishonest."
And, of course, no list of husband-and-wife teams would be complete without Nick and Nora Charles, the creation of Dashiell Hammett, who appeared in the classic American mystery, The Thin Man:
When the young woman approached Nick Charles and insisted he should search for her missing father, Nick really didn’t want to get involved. But each time he proclaimed his lack of interest, more and more people – including the police, the missing man’s family, a few assorted mobsters and more – became convinced that Nick knew something about the disappearance of that missing man – who may, by the way, have murdered his mistress. Eventually, he found himself forced into investigating the whole business – although he was careful not to let it get in the way of his serious drinking.
By the way, I have done podcast reviews for all four of these books. You can hear those reviews in their entirety by clicking on the appropriate links:
You can find other books by these authors on the backlist page as well.