Page:Agatha Christie - The Secret Adversary (1922).djvu/262

246 stitches would have rotted. They look just as good as new."

They cut them carefully and ripped away the oilsilk. Inside was a small folded sheet of paper. With trembling fingers they unfolded it. The sheet was blank! They stared at each other, puzzled.

"A dummy?" hazarded Julius. "Was Danvers just a decoy?"

Tommy shook his head. That solution did not satisfy him. Suddenly his face cleared.

"I've got it! Sympathetic ink!"

"You think so?"

"Worth trying anyhow. Heat usually does the trick. Get some sticks. Well make a fire."

In a few minutes the little fire of twigs and leaves was blazing merrily. Tommy held the sheet of paper near the glow. The paper curled a little with the heat. Nothing more.

Suddenly Julius grasped his arm, and pointed to where characters were appearing in a faint brown colour.

"Gee whiz! You've got it! Say, that idea of yours was great. It never occurred to me."

Tommy held the paper in position some minutes longer until he judged the heat had done its work. Then he withdrew it. A moment later he uttered a cry.

Across the sheet in neat brown printing ran the words: