The Case of the Daring Divorcee — Erle Stanley Gardner

Perry Mason and Della Street were both out to lunch. Gertie, the receptionist and telephone operator, was indulging in her favorite noontime occupation - munching chocolates and reading a love story - when the door burst open and a woman rushed in.

Gertie got her name, all right, dimly registered the fact that she was not only very attractive buy very upset at having to wait for Mason, and Gertie even looked up when the woman left before he returned.

But vicarious romance was the rule of that day - much to the annoyance of Lt. Tragg when he later tried to piece together what had happened. And although his plan for surprising Gertie into a identification of the lady was ingenious, Perry's counter-measure was even more so...