"Don't forget to set out the milk bottle before you barricade us in," Susan laughed.
Penny picked the bottle up from the kitchen table and crossed the porch to place it on the step. It took her so long outside that Susan came to the door to learn what detained her. She was astonished to behold Penny standing as rigid as a statue, her eyes riveted upon the garage door.
"What's wrong?" Susan inquired.
"Didn't I close that door when I put the car away?" Penny demanded in a low tone.
"Why, yes, I'm sure you did. The wind must have blown it open."
Penny shook her head.
"The door has a special catch so I know it couldn't have opened by itself. Susan, I believe someone has sneaked into the garage since we left it!"
Susan's eyes dilated with fear. Involuntarily, she took a step backwards, turning toward the kitchen door.
Penny caught her by the hand.
"Don't tell Mrs. Gallup or she'll go into hysterics. Let's find out if there really is anyone in the garage before we call the police."