"But how will he know?" demanded Ann.
"That's easy," laughed Ruth. "He will stand where he can watch her window. If he sees her candle lit, he will give the alarm."
"How?" asked Nettie.
"We'll rig a 'tick-tack'—you know what I mean?"
"Oh, don't I!" giggled Heavy.
"Roberto can pull the string below, and that will make a tick-tack rap on Nettie's window."
"Splendid!" cried the giver of the feast. "You just see if he will do it, Miss Fielding. And I'll give him a dollar—or more, if he wants it."
"A dollar will be a lot of money for Roberto," laughed Helen. "But he won't do it for that."
"No?"
"Of course not. He'll only do it because Ruth asks him."