With Christmas approaching and wild twin boys to raise alone, Seth Webster needs a miracle. His home is in chaos, the latest in a long line of exasperated housekeepers quitting in disgust, and he needs help keeping his family together. And then it arrives on his doorstep. Her name is Mrs. Merkle, but the kids call her “Mrs. Miracle” — and from the moment the warm, knowing, and very patient nanny appears, everything is different.