"Oh, but we can't wait till Tuesday! We only have a week before Mr Gauntlett has to make up his mind!"
"Then," said Jill, "Cam and Ricky must watch tonight and tomorrow, and we'll all watch on Tuesday."
"Is that all right then, Ricky?" Richard nodded. "Good," said John. "Then you two must watch for the boy and-"
"We've seen him, I think," said Cam. "Just a glimpse, disappearing behind the yews on the top terrace."
"Well, you must watch again," said John, "and follow him."
"Follow him?" said Cam in rather a wavering voice.
From CROOKED SIXPENCE, Chapter 2, Doing Good.