“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?”