There is something inherently terrifying about the so-called "impossible" crime - that mystery sub-genre which, during most of the 20th century, was dominated by the great author, John Dickson Carr. Most of his books dealt with one of two English detectives, either Dr. Gideon Fell or Sir Henry Merrivale. But before either of those characters was invented by Carr, he had another protagonist who solved the same kind of mysteries. His name was Henri Bencolin, a French police investigator. Bencolin turned in quite a performance in It Walks By Night (1930). That book is the subject of my audio review this week on the Classic Mysteries podcast, and you are welcome to listen to the complete review by clicking here.
It Walks By Night is narrated by a young American named Jeff Marle. Jeff is a friend of Bencolin, who is in Paris, visiting the detective.
I had come up from Nice in response to a wire from Bencolin saying merely that there was danger ahead and was I interested? – to which I wired back “Yes,” without knowing what he meant. As yet I knew nothing about the man who was to murder the Duc de Saligny and to walk through our dreams with his sly and grisly smile.
The man being pursued by Bencolin is Alexandre Laurent. Shortly after Laurent’s marriage, he tried to murder his wife. He was committed to an asylum for the criminally insane. He has now escaped from that asylum, committing some gruesome murders along the way. His now-former wife is about to marry a nobleman, the Duc de Saligny – and Laurent has threatened to murder the Duc in such a way that it will appear to have been impossible.
And that evening, as Bencolin and Jeff Marle watch the door of a room in a Parisian salon into which the Duc has entered…there is a murder in that room…but when the locked door is broken open, the only person in the room is the victim – who has been beheaded. There is no sign of Laurent – or anyone else, for that matter. Only the victim's body is there..
Here is how Bencolin sums up the situation:
“In short, there are no secret entrances; the murderer was not hiding anywhere in the room; he did not go out by the window, he did not go out the salon door under my watching nor the hall door…but he was not there when we entered. Yet a murderer had beheaded his victim there; we know in this case above all others that the dead man did not kill himself.”
And as later events proved, Bencolin spoke the absolute truth.
The Italics are the author's. If you're looking for impossibilities, you have just been challenged.
: It Walks By Night is currently available as an entry in the British Library Crime Classics series (though Carr was an American writer).It boasts an excellent introduction to Carr and to Bencolin by mystery historian and author Martin Edwards. You’ll also find a very rare short story which featured the first appearance of Bencolin. The story is called “The Shadow of the Goat,” originally published anonymously in 1926 – four years before It Walks By Night – in a publication at Haverford University, where John Dickson Carr was a student. It Walks By Night is a worthy addition to your collection.