She only let her guard down once. Once was enough.

On a warm spring day, exhausted new mother Portia settled down next to her new baby for a nap. She forgot to lock the back door. She forgot to turn on the alarm.

When she woke up, the back door was open...and her daughter was gone.

Mary vanished without a trace. Five years of heartbreak have gone by. Five years of her friends, her neighbors, even her family, pulling away. Only her devoted husband stands by her side, defending her against all accusations. Only her husband thinks their new baby will be safe with her.

But someone's sent her a gift that blows her whole world apart. It's the baby booties that her daughter was wearing the day she disappeared.

Now Portia's in a race against time to find out the truth. She won't be caught off guard again. And whoever's lurking in the shadows is about to find out – there's nothing more dangerous than a mother's love.