Enid Blyton 
The Mystery of the Strange Messages [EPUB ebook] 

Mr. Goon, the village policeman, was in a very bad temper. He sat at his desk, and stared at three pieces of paper there, spread out before him. Beside them were three cheap envelopes.
On each sheet of paper separate words were pasted in uneven lines. “They’re all words cut out of some newspaper, ” said Mr. Goon. “So’s the writer’s handwriting wouldn’t give him away, I suppose! And what nonsense they make—look at this one now—‘turn him out of the ivies!’ What does that mean, I’d like to know. And this one—‘ask smith what his real name is.’ Who’s Smith?”
He stared at the last piece of paper, “call yourself a policeman? better go and see smith.”
“Gah!” said Mr. Goon. “Better put them all into the waste-paper basket!” He took one of the envelopes and looked at it. It was a very cheap one, square in shape, and on each one was pasted two words only.