“I think those are the mountains bordering the City of Nite!” said the Princess. “And if that is the case we have not very much farther to travel.” But the mountains were farther away than the travelers thought, for after walking for an hour they came to a rise in the ground from which they looked across miles and miles of beautiful valley country. Gran’ma and Gran’pa said it was almost as pretty as the country round the farm back home. Down in the valley a little way they saw a tiny house and walked in that direction. When they came to the front gate and called no one answered, so they walked in and knocked at the door. As no one answered the knock they walked around to the back door and looked inside the kitchen, for the door was open. There on the stove were pots and pans filled with food which was cooking; and as they watched, one of the pots raised itself from the stove and poured its contents into another pot. Then another pot moved across the stove and its lid came off and hung itself in the air, while a large spoon raised itself from the back of the stove and stirred the contents of the pot. “Shall we go in?” Janey whispered, as they all hesitated on the step. Gran’pa raised his cane and knocked three times on the door sill. “What was that?” cried a man’s voice from the front part of the house. “Something hammered upon the door!” a woman’s voice in the kitchen answered. “But I can see nothing outside to cause the noise!” Gran’pa raised his cane and gave three more knocks. “Did you ever!” the woman’s voice cried. “I was looking right at the spot where the noise came from and I could not see a thing!” Evidently the man had come to the kitchen door and stood near the woman, for the travelers heard him speak right at the back door. “What could it have been, Ella?” he said. Gran’pa turned and winked at the others and again rapped three times with his cane upon the door sill. “There! You hear for yourself, Jules! There must be an invisible person knocking at the door!” “Is anyone there?” asked the man’s voice. “We are standing right here in plain sight!” Gran’ma replied. “Dear me!” the woman’s voice said. “I can see no one, can you, Jules?” “I can’t see anyone!” Jules answered. “Whoever it is must be invisible!” “It’s the Princess of Nite, Janey and Johnny, Gran’ma and Gran’pa Huggins!” Gran’pa said. “We can see ourselves easily, but you are invisible to us!” “Had we better ask them in?” Ella inquired of the man. [Illustration] “Yes, do come in!” he said in answer, and as Gran’pa was nearest the door, he walked in first and bumped right into the Invisible Man. “Please excuse me!” Gran’pa said. “I am sorry, but I did not see you!” “That’s all right,” the Invisible Man replied in a cheery voice. “I was standing right in the doorway and I should have moved out of your way!”