Respectable was the word for Prentice and Vaughan, solicitors to the best of families. And the body of a weird little man who called himself Abu of Ispahan lying with a dagger in his heart on the waiting room floor was embarrassing to say the lesat. The whole incredible thing had happened right before their eyes. Prentice and Vaughan knew that they hadn't done it . . . But no one else was there.
Used availability for John Dickson Carr's Patrick Butler for the Defense
December 1966 : UK Hardback
June 1992 : USA Paperback