"It is presumed so, since she bolted with my car and hasn't turned up. Her name is unknown, so the verdict is quite right."
"But persons," persisted Lady Mabel inquisitively.
"A mere graceful addition to round off the sentence. I believe that this woman stabbed Mrs. Caldershaw with a sapphire-headed hat-pin."
"Sapphire-headed; she must have been rich."
"Oh, Vance is drawing on his theatrical imagination," struck in Cannington impatiently, "the sapphire he talks of was only blue glass."
"Oh, that reminds me that the papers said something about a glass eye."
"I expect they said a very great deal about it," I assented gravely. "Catch your journalist missing a chance of hinting at mystery."
"Is it a mystery?" asked Mabel, walking before us into the station.
"More or less--possibly more. Mrs. Caldershaw was murdered by this unknown woman, presumably for the sake of her glass eye."
"But why?"