According to Marcus Chesney, eye-witnesses were unreliable. To observe something, then to relate accurately what was just seen, he felt was impossible.

To prove his point, Chesney set up a test. With witnesses looking on, he calmly sat still while a sinister scarecrow of a man entered the room, walked over to him...and murdered him!

All the suspects were witnesses; each could alibi another. Logically, therefore, no one could have murdered Marcus Chesney. But then why was he dead?

It take Gideon Fell to unravel this Golden Age classic.