The Secret Adversary

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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.
We'll 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.