"But why should she have stabbed him?"
"We can't say until we know the lady. Did you recognise her?"
"No; she was masked and cloaked."
"A green domino, I think you said."
"And a green mask," supplemented Shepworth.
"She must have been at Mrs. Rover's ball," mused Bruge.
"Not necessarily," interpolated Prelice; "but as many people masked and cloaked were ascending and descending the stairs, she may have taken advantage of the ball to get into this flat unobserved."
"Quite so," assented the Inspector; "but who admitted her?"
"Agstone must have done that," said Shepworth.
"Probably; but who admitted Agstone?"