out and transferred to the other car, and a pair of substitutes take their places."
"Impossible!"
"Pas du tout! Have you not seen music-hall turns imitating celebrities with marvellous accuracy? Nothing is easier than to personate a public character. The Prime Minister of England is far easier to understudy than Mr. John Smith of Clapham, say. As for O'Murphy's 'double,' no one was going to take much notice of him until after the departure of the Prime Minister, and by then he would have made himself scarce. He drives straight from Charing Cross to the meeting-place of his friends. He goes in as O'Murphy, he emerges as some one quite different. O'Murphy has disappeared, leaving a conveniently suspicious trail behind him."
"But the man who personated the Prime Minister was seen by every one!"
"He was not seen by anyone who knew him privately or intimately. And Daniels shielded him from contact with anyone as much as possible. Moreover, his face was bandaged up, and anything unusual in his manner would be put down to the fact that he was suffering from shock
