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THE THREE COFFINS (THE HOLLOW MAN) (1935) by John Dickson Carr is celebrated for its exceptional execution of the locked-room mystery, a subgenre demanding ingenious plotting and cerebral depth. Many consider it the best locked room mystery of all time. Carr’s complex puzzles, cryptic clues, and taut, suspenseful atmosphere make it a mystery fiction masterpiece.

Read: Buy the book on Amazon.

Reflect: Check out the conversation starters below.

The Novel as a Riddle

“To the murder of Professor Grimaud, and later the equally incredible crime in Cagliostro Street, many fantastic terms could be applied — with reason. Those of Dr Fell’s friends who like impossible situations will not find in his case-book any puzzle more baffling or more terrifying. Thus: two murders were committed, in such fashion that the murderer must have been not only invisible, but lighter than air. According to the evidence, this person killed his first victim and literally disappeared. Again according to the evidence, he killed his second victim in the middle of an empty street, with watchers at either end; yet not a soul saw him, and no footprint appeared in the snow.”

Locked Room Lecture / Breaking Down the Third Wall

Ch. 17 contains the oft-cited “locked room lecture,” where Fell speaks directly to readers. Fell says, “[W]e’re in a detective story, and we don’t fool the reader by pretending we’re not.” Fell then describes the various ways murder can be committed in a locked room.

From the books we’ve read, Is this the first break in the third wall?

Method #7 from The Three Coffins (The Hollow Man) by John Dickson Carr: “The victim is presumed to be dead long before he really is. The victim lies asleep drugged (but not harmed) 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. The honour of inventing this device belongs to Israel Zangwill [The Big Bow Mystery].”

Pettis says, “[It] would seem pretty sound to say exclude the impossible and whatever remains, however improbable, must be the truth.” (Sherlock Holmes, The Sign of the Four, 1890) (Compare with Poirot in Murder on the Orient Express, 1934: “The impossible cannot have happened, therefore the impossible must be possible in spite of appearances.”)

In The Story of Classic Crime in 100 Books (2017), Martin Edwards called this chapter “an extraordinarily bold move.” Do you agree? How did you feel about this chapter? And have the books John Dickson Carr mentioned stood the test of time as greats? 

G.K. Chesterton was mentioned for the man in the passage. In The Wrong Shape, similar to Israel Zangwill, the killer rushes in pretending they are already dead and kills th

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