He could see that there was a fare inside, but no more than that. The driver looked several times at O’Callaghan’s chauffeur and called out something which his man answered gruffly. O’Callaghan had the feeling that the person inside the taxi stared in at his window. He was being watched. He had experienced this sensation many times lately. He thought, with a sort of amusement, of the Prime Minister’s anxiety. He pulled a cord and the inside of the car was flooded with light.

“Give them a good view while I’m about it,” he thought grimly.

To his surprise the windows of the taxi were lit up as if in answer. He peered across, shading the pane with his hand. The taxi’s fare was a solitary man in a dinner-jacket. He sat with his hands resting on the knob of a stick. His silk hat was worn at a slight angle, revealing a clear-cut and singularly handsome profile. It was an intelligent and well-bred face, with a straight nose, firm mouth and dark eyes. The man did not turn his head, and while Sir Derek O’Callaghan still watched him, the ranks of cars moved on and the taxi was left behind.

“That’s someone I know,” thought O’Callaghan with a kind of languid surprise. He tried for a moment to place this individual, but it was too much bother. He gave it up. In a few minutes his chauffeur pulled up outside his own house in Catherine Street and opened the door of the car.

The Home Secretary got out slowly and toiled up the steps. His butler let him in. While he was still in the hall his wife came downstairs. He stood and contemplated her without speaking.

“Well, Derek,” she said.

“Hullo, Cicely.”

She stood at the foot of the stairs and watched him composedly.

“You’re late,” she observed after a moment.

“Am I? I supposed I am. Those fellows jawed and jawed. Do you mind if I don’t change? I’m tired.”

“Of course not. There’s only Ruth dining.”

He grimaced.