The Murder of Dr. Harrigan (Clue Club #6: The Murder of Dr. Harrigan) (1936)

Crotchety hospital administrator Peter Melady, self-proclaimed developer of a new wonder anaesthetic, is about to undergo a delicate operation to be performed by the glib Dr. Leo Harrigan, Melady's longtime mutual adversary. Police are called when the murdered body of Harrigan is found in an elevator, and Melady, last seen being wheeled on a gurney to surgery by Harrigan, has disappeared.