The Strange Boarders of Palace Crescent by E. Phillips Oppenheim

The last shadow of that wild moment of apprehension on Freda Medlincott's part disappeared when she found Major Lengton waiting for her on the Thursday morning in the Berkeley at the appointed hour, and with him a young man whom she easily recognised as the much-sought-after Sam Blundell. Afterwards, she almost purred to herself when she thought of her success that morning. She talked in her most engaging manner to each man in turn. Her face was radiant with smiles. She felt herself full of confidence. Her moment of supreme triumph came, however, when Sam Blundell, after looking at her hard for a moment, suddenly threw up his hands.

"Why," he said, "you are the girl who did that clever little shadow dance in the street with Bill Ayres, in _Barlot's Revue_. Freda Low, I thought her name was."