The Judas Window by John Dickson Carr (writing as Carter Dickson).
One of the five best locked room mysteries, as selected by 14 established mystery authors and critics (All But Impossible!, 1981. ed. E. Hoch).
The Case:...
When Rupert Sethleigh's body is found one morning, minus its head, laid out in the village butcher shop, the inhabitants of Wandles Parva aren't particularly upset. Sethleigh was a blackmailing money lender and when the unconventional detective...