Deathbed of Roses — Deborah Scott

It was Aunt Delia's birthday, and Beth Hendry, her secretary, was invited to the gathering at the estate. There were no happy returns of the day, however, for someone was trying to murder the wise old matriarch. Then time ran out, and as terror enveloped the big house, Beth discovered that she had played right into the hands of a killer...for Death was the uninvited guest at the birthday party....