“Sergius Hertzen.”

As the words rang through the place I started. I had not seen Vera’s uncle since our marriage, as he went to Zurich immediately afterwards.

There was a shuffling near the door, and the old man entered. As he mounted the steps to the witness-box I noticed he had aged considerably.

“What are you, Mr Hartzen?” Mr Paget asked, referring to his brief at the same moment.

“Police agent.”

“And your nationality?”

“Russian.”

The old man a police agent! Dumbfounded, I looked blankly around me.

“You are father of the previous witness?”

“I am.”