

UNITED STATES AUTHOR · FICTION · DETECTIVE AND MYSTERY
John Dickson Carr
Also known as: Dickson Carr, Roger Fairbairn
John Dickson Carr was a very highly regarded American mystery writer, though he lived for most of the '30s and '40s in England, married there and set many of his books there (Wikipedia). His two main detectives, Dr. Fell and Sir Henry Merrivale, were very English (Wikipedia).
Caitlyn O'Malley was a lass, but none would have known it who saw her swaggering along Dublin's narrow cobbled laneways on that misty April afternoon in 1784.
— from Dark of the moon
Most acclaimed

The Black Spectacles
1969
Published in the United States as The Problem of the Green Capsule A Dr Gideon Fell mystery >"Most people," declared Marcus Chesney, "are absolutely incapable of describing accurately what they see or hear. If they see a street accident, a riot, or fight, their minds are so muddled that every account will be wildly at variance, and of no value to the police." But all his friends disagreed with this. So Marcus Chesney challenges them to a test. He will stage a very brief show for them, with his office as a stage and folding doors as a curtain. They shall sit in another room and watch it, while a powerful light shines on the stage and the whole performance is recorded with a cine-camera. Afterwards the guests must answer accurately a series of questions Chesney has prepared for them. >Thus, three persons saw the murder done, and afterwards not one of them was able to tell what had happened. Who, for instance, was the figure in black spectacles? What was the time by the clock on the mantelpiece? And what was the curious article - described by one person as a pen, by another as a pencil, and by a third as a blowpipe dart - which Chesney picked up in the course of the show? >The murder of Marcus Chesney comes as a conclusion of a series of senseless poisonings which have been terrifying the village of Sodbury Cross. Chesney's niece, Marjorie Wills, is under strong suspicion; but the evidence against her is not strong enough, and, at the murder of her uncle, she, like everybody else, has a sound alibi. >Dr. Fell, taking the waters at Bath, is summoned by Inspector Elliot. And Dr. Fell's explanation of the real black spectacles is perhaps the greatest detective triumph of his career.

Hag's Nook
1933
Hag's Nook, first published in 1933, is a detective novel by John Dickson Carr and the first to feature his series detective Gideon Fell. Tad Rampole is a young American traveling in England who, in a chance encounter on a railway platform, meets and falls in love with Dorothy Starberth. Rampole has a letter of introduction to Dr. Gideon Fell and both soon become involved in the affairs of the Starberth family. The family has a long history as having been the governors of Chatterham Prison and, in connection with that post, there is also a tradition that the "Starberths die of broken necks". Chatterham is now abandoned and inhabited only by rats, but the eldest son and heir to the Starberth family must spend the evening of his 25th birthday there, as directed by an ancestral will.

Dark of the moon
Virgil Flowers-tall, lean, late thirties, three times divorced, hair way too long for a cop's-had kicked around for a while before joining the Minnesota Bureau of Criminal Apprehension. First, it was the army and the military police, then the police in St. Paul, and finally Lucas Davenport had brought him into the BCA, promising him, "We'll only give you the hard stuff."He'd been doing the hard stuff for three years now-but never anything like this. In the small town of Bluestem, where everybody knows everybody, a house way up on a ridge explodes into flames, its owner, a man named Judd, trapped inside. There is a lot of reason to hate him, Flowers discovers. Years ago, Judd had perpetrated a scam that'd driven a lot of local farmers out of business, even to suicide. There are also rumors swirling around: of some very dicey activities with other men's wives; of involvement with some nutcase religious guy; of an out-of-wedlock daughter. In fact, Flowers concludes, you'd probably have to dig around to find a person who didn't despise him.And that wasn't even the reason Flowers had come to Bluestem. Three weeks before, there'd been another murder-two, in fact-a doctor and his wife, the doctor found propped up in his backyard, both eyes shot out. There hadn't been a murder in Bluestem in years-and now, suddenly, three? Flowers knows two things: This wasn't a coincidence, and this had to be personal.But just how personal is something even he doesn't realize, and may not find out until too late. Because the next victim . . .may be himself.Filled with the audacious plotting, rich characters, and brilliant suspense that have always made his books "compulsively readable" (Los Angeles Times), Dark of the Moon is vintage Sandford, further proof that he "is in a class of his own" (The Orlando Sentinel).