"This is probably intended for a way of escape in case of fire," said the old detective. "Shut the door, Leggett, I'll get out my flash light and we will go on down."
"It's mighty dangerous business, Mr. Brady."
"Of course. Come on!"
He led the way and they descended the stairs, ending up at a door covered with sheet iron which had neither lock nor knob.
"Balked," breathed Leggett.
"Balked nothing," replied Old King Brady. "This door is controlled by a spring which works in the simplest sort of fashion."
He pressed it and the door flew open.
The long, lighted corridor already described lay beyond.
Old King Brady surveyed its many doors in silent dismay.
"Now we are balked," he whispered. "This is more than a Chinese puzzle. Which door to choose?"