Okay, the premise sounds a little strange but this is my absolute favorite book. I've never mat anyone who read this book who did not immediately go out and buy it for their best friend or their mother or their daughter. Most Persephone books are wonderful, but this one is far and away the one to start with!
Miss Pettigrew is a dowdy governess who doesn't much like children and is down on her luck. She accidentally gets sent to the flat of a glamorous nightclub singer who is having all sorts of man trouble, which Miss Pettigrew promptly fixes with a combination of her wits and her totally common sense attitude about life.
It's a light and very easy read, definitely loose on the realism. But really, I promise that you will NOT regret it if you buy this book.