They touched their buttons, went invisible.
Silently, then, they stole from the apartment. Swiftly they made their way down to the concourse, raced across the city to the amber court, descended to the trap-door.
It must be nearly twelve, Kendrick knew. He couldn't look at his watch, for it as well as himself was invisible. Indeed, even as they stood there, poised for the plunge, a faint whistle rose from below.
Marjorie trembled.
"Steady!" he spoke. "Some of them always blow a minute or two before. Are you ready?"
"Yes!"
"Then press your button—jump!"
Even as they leapt, the sickening thought came that perhaps the escalator ray was no longer running. But the fear was unwarranted. They were caught up, whirled gently downward.
Moving along laterally, as they descended, they were able to land without difficulty in the middle of a deserted street near the Consolidated Electric laboratory.
"Thank heaven!" she sighed, as their feet touched solid ground. They pressed off both buttons, becoming visible once more.