“Late for what?” Norma asked.
“We’re spotters. I’m Beth and this is Bess, my sister,” one of the twins explained.
“We’re on from now until midnight,” the other said.
“Whew!” Norma exclaimed. “That’s a long spot for a spotter.”
“Oh, we don’t mind,” said Beth, laughing. “Only one is needed to watch at a time.”
“The other one studies. We’re still in high school,” said Bess. “Sometimes we fall asleep.”
With a final snort the motorcycle reached the crest of the hill, then circled to a stop at the foot of a crooked stairway leading to a crow’s-nest perch above.
Up, then around, then up again, they climbed thirty feet into the air to arrive at last at a broad enclosed platform.
“All right, girls, you may take over.” A tall man with prematurely gray hair turned toward a door leading from the platform. “Who’s your friend?” he asked, turning half about. Behind his thick glasses Norma saw keen, smiling eyes.
“Why, she—” Beth hesitated.