Anita wondered what had been the grim thoughts of the man as he pondered on the mass of stuff, the tissue of falsehoods that the blackmailing detective had handed to him at such great cost.
At last the cone of light rested on a little safe at the opposite end.
"There it is," whispered Anita, pointing, half afraid even of the soft tones of her own voice.
Constance had pulled down all the shades quietly, and drew the curtains tightly between the room and the foyer.
On the top of the safe she was pouring some of the powder in a neat pile from one of the vials.
"What is that ?" asked Anita, bending close to her ear.
"Some powdered metallic aluminum mixed with oxide of iron," whispered Constance in return.

"I read of this thing in a scientific paper the other day, and I determined to get some of it.

But I didn't think I'd ever really have occasion to use it." She added some powder from the other vial.
"And that ?" "Magnesium powder." Constance had lighted a match.
"Stand back, Anita," she whispered, "back, Anita," she whispered, "back in the farthest corner of the room, and keep quiet.

Shut your eyes--turn your face away!" There was a flash, blinding, then a steady, brilliant burst of noiseless, penetrating, burning flame.
Anita had expected an explosion.

Instead she found that her eyes hurt.
She had not closed them tightly quick enough.
Still, Constance's warning had been sufficient to prevent any damage to the sight, and she slowly recovered.
Actually, the burning powder seemed to be sinking into the very steel of the safe itself, as if it had been mere ice! Was it an optical illusion, a freak of her sight?
"Wh-what is it!" she whispered in awe, drawing closer to her friend.
"Thermit," whispered Constance in reply, as the two watched the glowing mass fascinated, "an invention of a German chemist named Goldschmidt.
It will burn a hole right through steel--at a terrific temperature, three thousand or more degrees." The almost burned out mass seemed to fall into the safe as if it had been a wooden box instead of chrome steel.
They waited a moment, still blinking, to regain control over their eyes in spite of the care they had used to shield them.
Then they tiptoed across the floor.
In the top of the safe yawned a hole large enough to stick one's hand and arm through! Constance reached into the safe and drew out something on which she flashed the pocket light.
There was bundle after bundle of checks, the personal checks of a methodical business man, carefully preserved.
Hastily she looked them over.