As Seth Webster mourns the death of his wife, he must still care for his rambunctious six-year-old twin boys. When he is about to give up on finding a housekeeper that can handle them, Emily Merkle – who the boys dub 'Mrs. Miracle' – arrives to boost their Christmas spirit. As she plays matchmaker for Seth and the boys' Christmas pageant director, who is also dealing with past love lost, the Webster family realizes that she isn’t an ordinary housekeeper.