Captain Jimmy Allenson

In the short story The Shadow on the Glass, Captain Jimmy Allenson is of the guests of the Unkertons at Greenway's House. It is at this party where much of the events in the plot take place.

Allenson is described as a handsome young man of about thirty, "with white teeth and an infectious smile". Lady Cynthia Drage, who had reservations about the Unkertons choice of some of the guests, nonetheless welcomed the presence of Allenson. She described him as "a nice boy" who "saved" her life in Egypt last winter when she was so bored.

During the course of the party, Allenson is shot dead with another guest, Moira Scott. Solving the mystery of the shooting forms much of the later part of the plot.