“If she does suspect, then she is cleverer than you anticipated,” I remarked.

“Yes. But in any case we had better act independently. You return to the platform, for she has never seen you. You will remain well concealed and watch them meet, while I shall be at the exit to identify him if you find that you cannot get near enough to him without courting observation.”

As he spoke the bell was clanging, and there came the roar of the engine entering the big echoing station.

I slipped back instantly upon the platform and standing at a point against the corner of the bookstand where I hoped to escape unobserved, I turned my head away as the train came along. Then, when it drew up, I held my breath anxiously as I turned around.

The girl in navy blue was not far from me searching along the train until, of a sudden, she espied a man in a dark overcoat and dark-green velour hat, who had just alighted, carrying in his hand a small leather case. His countenance was ruddy, and he had a small black moustache.

My heart fell. The man was a stranger to me! The countenance was not that of the man whom I had surprised in my bedroom at Madrid. He bent and greeted her affectionately, but next moment it was apparent that she was explaining something which caused his countenance to grow serious.

He put one or two swift questions to her. Then halting suddenly, he glanced at his watch.

I strove to get sufficiently near to look well into his face, but I feared recognition.

Would he pass out of the exit where the famous Spanish detective was awaiting him? Rivero knew Despujol by photographs, and indeed had been present when he had been convicted on the last occasion a few years before.

Mademoiselle’s friend hesitated for some moments, and then accosting a porter asked a question. The man pointed to a train on the opposite platform.