Just then there was the sound of many feet running up the stairs from the other door.
"How about one of the gallery doors ?" asked Grace.
"They are all locked," answered David.

"There only remain the skylight trap-door and the roof.

Do you think you could manage it if I helped you ?" "Of course; we could manage anything," protested the freshmen girls.
It was an easy matter to climb up the ladder, and clamber through the trap-door on to the roof.
"We're just in time," whispered David.

"They have found the right key to the gallery door, and they'll be coming in both ways.

Crawl carefully now, girls, for heaven's sake, and don't slip!" The seven young people began slowly to draw themselves along the gymnasium roof on their hands and knees.