x masked and hooded figures swung down High School Street together,
talking and laughing in low voices. The smallest of the six appeared to
stumble over her feet, and once tumbled in the road. Her friends gayly
helped her up, when it was disclosed that she wore a pair of boy's shoes
much too large for her.

"If we don't break our necks stumbling over these brogans," whispered
the tallest girl, "we'll be lucky."

As a matter of fact, each one of the six maskers was wearing a pair of
men's shoes.

"I stuffed my toes with cotton," laughed another, "but even now they are
hard to manage."

Just then a motor cycle shot past them, slowed down and stopped
altogether.

The rider rested it against a tree and came back.

"I recognized you by your big feet," he said in a whisper. "Grace,
here's the duplicate key to the laboratory. I had some trouble getting
it, but no one knows, and you'll be safe enough. I'll let myself in with
the other duplicate key and lock the door. They will be sure to try it
at intervals. If you get into any trouble, early in the evening, make a
dash for the steps and blow your horn loud. Now, that's all, I think.
I'll be hidden in the laboratory until my turn comes. Good-bye and good
luck!"

In another instant he was off on his motor cycle.

Six figures, well disguised in dominoes of as many hues, presently
appeared on the ball room floor, just in time for the grand march. It
was a pity no one, except the lone teacher, was permitted to look at the
brilliant picture. But such was the tradition of the class. After the
march, ten ballet girls in tarlatan skirts, their faces concealed by
little black satin masks, gave a performance. Following this, a Spanish
dancer, whom the six dominoes recognized at once as the treacherous
Miriam Nesbit, gave an exhibition of her skill.

"I'm going to have some fun with her," whispered the blue domino to the
red one. "Just follow me and see."

The last speaker joined the dancer as the music struck up a waltz.

"That was a good day's work you did for our class, not long ago," she
whispered as they danced off together.

"What do you mean?" asked the Spanish dancer.

"I mean the Black Monks of Asia. Now, do you understand?"

"But I thought it was not to be told," exclaimed the dancer, flushing
under her mask.

"Only to the committee so that you might be rewarded with an
invitation," whispered the domino, as she slipped away.

"_She_ did confess it, and every