The three books are: The Unexpected Mrs. Pollifax, The Amazing Mrs. Pollifax, and The Elusive Mrs. Pollifax. My favorite was the "Unexpected" one, which is the first in the series.
Genre: Cozy Mystery
Length: 554 Pages (almost two inches thick)
Amazon Link: Mrs. Polifax X 3
I have had this book on my shelf for years--probably bought from a Friends of the Auburn Library sale.
Opening of "Unexpected":
The nurse walked out of the room, closing the door behind her, and Mrs. Pollifax looked at the doctor and he in turn looked at her. He was a very nice young man, with black hair, very white teeth and horn-rimmed glasses that he removed now, placing the stem of the earpiece between his teeth. "Well, Mrs. Pollifax," he said pleasantly, "I don't know how you manage it, but for a woman of your age you're in fantastically good health. I congratulate you."
"Oh," said Mrs. Pollifax flatly, and the doctor glanced at her with such a peculiar expression that she added brightly, for his benefit, "Oh!"
The Friday 56 (from page 56 of my hardback book):
Even the homes that showed briefly in the glare of the headlights looked inhospitable, their rooftops barely seen over the tops of high walls that surrounded them. The walls were guarded by huge gateways with iron-studded doors--clearly not a trusting neighborhood, thought Mrs. Pollifax--and then they had left the town behind.
Synopsis (from Amazon): Here in one volume are three Mrs. Pollifax novels by the incomparable Dorothy Gilman. So curl up on the couch or in your favorite chair and follow the world's most unlikely secret agent on three missions filled with intrigue, danger and fun.