Murder Most Flummoxing

I've been constantly tired and listless for the last few days, so today's entry is mostly a cut and paste of someone else's writing.

The "Golden Age" of British (read: English) crime fiction is usually reckoned to be roughly 1920-1950.

The dominant sub-genre was the "locked room mystery" - the seemingly impossible crime. The literal locked room crime involves a corpse being found in a room with no entrances or exits except one door, which is of course locked - from the inside. Often the victim is shot or stabbed, but there's no knife or gun to be found.

There are other impossible crimes in the genre - a man might be shot at point blank range but with no one near him, or found dead in the sand or snow with only his own footprints leading to him, or he might have been lying there for a day before discovery but have witnesses seeing him alive the hour before.

The author from that time most admired and collected is John Dickson Carr, a Brit living in America but setting his mysteries back in England. His most celebrated mystery is The Hollow Man (published in America as The Three Coffins).

Chapter 17 is set aside for a self-referential lecture from the detective, Dr Fell, on the subject of...locked room murders in fiction and their solutions.


He lists 7 types. Here is a precis of what he has to say:

1. It is not murder, but a series of coincidences ending in an accident which looks like murder. At an earlier time, before the room was locked, there has been a robbery, an attack, a wound, or a breaking of furniture which suggests a murder struggle. Later the victim is either accidentally killed or stunned in a locked room, and all these incidents are assumed to have taken place at the same time.

2. It is murder, but the victim is impelled to kill himself or crash into an accidental death. This may be by the effect of a haunted room, by suggestion, or more usually by a gas introduced from outside the room.

3. It is murder, by a mechanical device already planted in the room, and hidden undetectably in some innocent-looking piece of furniture. It may be a trap set by somebody long dead, and work either automatically or be set anew by the modern killer.

4. It is suicide, which is intended to look like murder. A man stabs himself with an icicle; the icicle melts; and, no weapon being found in the locked room, murder is presumed.

5. It is a murder which derives its problem from illusion and impersonation. Thus: the victim, still thought to be alive, is already lying murdered inside a room, of which the door is under observation. The murderer, either dressed as his victim or mistaken from behind for the victim, hurries in at the door. He whirls round, gets rid of his disguise, and instantly comes out of the room as himself.

6. It is a murder which, although committed by somebody outside the room at the time, nevertheless seems to have been committed by somebody who must have been inside.

The door is locked, the window too small to admit a murderer; yet the victim has apparently been stabbed from inside the room and the weapon is missing. Well, the icicle has been fired as a bullet from outside – we will not discuss whether this is practical...

The victim may be stabbed by a thin swordstick blade, passed between the twinings of a summer-house and withdrawn; or he may be stabbed with a blade so thin that he does not know he is hurt at all, and walks into another room before he suddenly collapses in death. Or he is lured into looking out of a window inaccessible from below; yet from above our old friend ice smashes down on his head, leaving him with a smashed skull but no weapon because the weapon has melted.

7. This is a murder depending on an effect exactly the reverse of number 5. That is, the victim is presumed to be dead long before he actually is. The victim lies asleep (drugged but unharmed) in a locked room. Knockings on the door fail to rouse him. The murderer starts a foul-play scare; forces the door; gets in ahead and kills by stabbing or throat-cutting, while suggesting to other watchers that they have seen something they have not seen.


He goes on to list 5 ways the door can tampered with to create the mystery:

1. Tampering with the key which is still in the lock. This was the favourite old-fashioned method, but its variations are too well known nowadays for anybody to use it seriously. The stem of the key can be gripped and turned with pliers from outside...

2. Simply removing the hinges of the door without disturbing lock or bolt.

3. Tampering with the bolt. String again: this time with a mechanism of pins and darning-needles, by which the bolt is shot from the outside by leverage of a pin stuck on the inside of the door, and the string is worked through the keyhole.

4. Tampering with a falling bar or latch. This usually consists in propping something under the latch, which can be pulled away after the door is closed from the outside, and let the bar drop.

5. ...The murderer, after committing his crime, has locked the door from the outside and kept the key. It is assumed, however, that the key is still in the lock on the inside. The murderer, who is first to raise a scare and find the body, smashes the upper glass panel of the door, puts his hand through with the key concealed in it, and "finds" the key in the lock inside, by which he opens the door.

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