When the two grown daughters of Elizabeth Marshall discover an old diary of their mother's in her attic, it comes as a shock to learn that the true love of Elizabeth's life was not their father. This is the mystery the two daughters must unravel as they stay up late reading the words penned by Elizabeth so long ago. Their mother can't give them the answers: After a massive stroke, she lies mute and near death in a nursing home. Only the pages of her diary can provide clues to what really happened.

In a richly detailed journey into the past, we see Elizabeth lose her heart to one man while remaining devoted to another. Finally, she must choose between the stable, loyal Bob...and the electrifying and unpredictable A.J., who spent time in juvenile detention as a teen. When a suspicious fire in the neighborhood is linked to A.J., Elizabeth is faced with another dilemma: She's the only one who can clear A.J.'s name, but to do so would ruin her reputation. Surprisingly, it's Bob who comes to the rescue, forcing Elizabeth to make perhaps the most painful decision of her life....

The Diary is a love story. It's also the story of the unshakable bond between a mother and her daughters.