For the first time in her eleven years, Mandy is alone. Through a series of miscommunications, her entire family has left her by herself in their big house on Lake Michigan. But it's the absence of her twin sister, Angel, that she feels the most. One year ago Angel died, and Mandy's life has been at a standstill ever since. While the rest of her family has moved on, Mandy still clings to the pain of her loss.

At first, Mandy is almost relieved to have the time to herself. But quickly the loneliness consumes her -- until she stumbles upon two boys, one her age, the other not yet two, who are also on their own. Running away from men who wish to do them harm, the boys turn to Mandy for help. But what can she do for these boys when she can barely take care of herself? If only Angel were here, she would know what to do.

But Angel isn't here, and Mandy can't let the men hurt these boys. So she takes them in, and in turn, makes a remarkable discovery about herself, her sister, and the very special bond they shared.