came on all
at once!"

Paula waited. The whistling noise went on. It was vaguely discordant,
and it was monotonous, and it was more than a little irritating. Again
it changed timbre, going up to the shrillest of squealings, and back
nearly to its original sound an instant later.

Bell began to paw over maps. The plane had been intended for flight
over the vast distances of Brazil, and there was a small supply of
condensed food and a sporting rifle and shells included in its
equipment. Emergency landing fields are not exactly common in the back
country of South America.

"Here," said Bell sharply. "Here is where we are. It must be where we
are! No towns of any size nearby. No railroad. No boat route. Nothing!
Nothing but jungle shown here!"

* * * * *

He frowned absorbedly over the problem.

"What is it?" asked Paula.

"Someone near," said Bell briefly. "That's another radio receiver, an
old fashioned regenerative set, sensitive enough and reliable enough,
but a nuisance to everyone but its owner--except when it's a godsend,
as it is to us."

The music ended, and a voice announced in laboriously classic
Portuguese, with only a trace of the guttural tonation of the
_carioca_, that the most important news items of the day would be
given.

Paula paled a little, but listened without stirring. The voice
read--the rustling of sheets of paper was abnormally loud--a bit of
foreign news, and a bit of local news, and then....

She was deathly pale when the announcement of her father's death was
finished, and she had heard the official view of the police
reported--exactly what Ribiera had told her it would be. When the
voice added that a friend of the late Minister of War, the Senhor
Ribiera, had offered twenty contos for the capture of the fugitive
pair, who had escaped in an airplane stolen from him, she bit her lip
until it almost bled.

* * * * *

"I know," he said abstractedly. "It's as you said. But listen to that
whistle."

The news announcement ceased. Music began again. The whistling
abruptly died away.

"I just found some coils," said Bell feverishly, "that plug in to take
the place of the longer-wave ones. I'm going to try them. It's a
hunch, and it's crazy, but...."

There were sharp clickings. The radio receiver was one of those
extraordinarily light and portable ones that are made for aircraft. In
seconds it was transformed into a sh