The Christmas Box / Timepiece / The Letter
I love this story even though it is so sad. I read the first book, The Christmas box, most Christmases. I have read the second book a few times and I was sure I'd read the last book but now I know I hadn't. I just finished reading them all and my heart is so full.
The first book starts with the end. When Mary is an elderly woman living alone in a huge mansion and has put an ad in the paper for a live in family to help with meals and with maintaining the home. It doesn't take long for the young couple and their 3 year old daughter to fall in love with Mary. After a while they started to worry about Mary and wondered about some things they had found. As they search for those answers they learned some valuable lessons from Mary.
The second book, The Timepiece, goes back to the beginning when MaryAnn first applied for a job with David's company. This book tells the story of their love and loss.
The third book, The Letter, is as long as both the first combined. It is the end of the story and I can't really say much about it without giving away too much about the other two books. You just have to read them all.