A ruby set in a big platinum ring.

I saw her hand upon the knob." Miss Donovan's blood raced fast.

She knew that woman.

It was Celeste La Rue! She remembered her because of a press-agent story that had once been written about the ring, and from what Miss Donovan knew of Miss La Rue, she did not ordinarily seek men; therefore there must have been a grave reason for her presence in John Cavendish's apartments immediately after she learned of Frederick's death.
Had his untimely end disarranged some plan of these two?
What was the reason she had come in person instead of telephoning?
Had her mysterious visit anything to do with the death of the elder Cavendish?
A thousand speculations entered Miss Donovan's mind.
"How long was she in the apartment ?" she demanded sharply.
"Fifteen or twenty minutes, miss--until after the hall-man came back.
I had to help lay out the body, and could not remain there any longer." "Have you told any one else what you have told me ?" "Only Josette.

She's my _fiancee_.