Postscript to Poison, Paperback by Bowers, Dorothy, ISBN 1899000089, ISBN-13 9781899000081, Brand New, Free shipping in the US

Cornelia Lackland ruled her house with an iron fist and a firm grasp on the pocketbook. When she dies mysteriously on the night before she was due to change her will, Chief Inspector Dan Pardoe of Scotland Yard must be called to investigate an ever growing list of suspects.