The End of Mr. Garment — Vincent Starrett

A novelist meets an abrupt end in this cozy mystery by the author of Dead Man Inside.

Stephen Garment, one of England's greatest writers, is late for an engagement at the fashionable Chicago home of Mr. and Mrs. Howland Kimbarks. Fortunately, he's just outside in a taxicab. Unfortunately, he's dead . . .

Garment was alive when he entered the cab, and the doors were not opened. Somehow, he managed to arrive at his destination with a knife in his heart.
The authorities are unable to find any leads, and the case sits quietly until word gets to brilliant amateur detective Walter Ghost. Ghost knows his way around puzzling crimes like this one. And with Ghost on the case, the killer can be certain they won't miss their day in court . .