Little Mr. Grey and his still "littler" wife, are surprised to receive a letter from their sister saying she is sending her dear little girl to spend a month with them. They prepare a room with dainty, doll-like furniture, but when little Mary arrives, it is found she will not even fit in the door. She is so tall and so broad that she can take both uncle and aunt up in one arm. And the poor postman who brought this precious package by parcel post, thinks it the worst ever, even worse than chickens, monkeys, dancing bears and other impediments he has been loaded down with.
—Moving Picture World synopsis