"You say you knew it was a woman with the man by the perfume. What kind of perfume was it?"
"Violet."
"Did you notice a violet perfume any other place that night?"
"In your uncle's living-room."
"Sure?"
"Yes."
"So did I."
"The woman I met on the stairs, then, had just come from your uncle's rooms."
"Looks like it," he nodded in agreement.
"Then we've got to find her. She must have been in his apartment when he was killed." The thought came to Rose as a revelation.