The Czar's Spy by William le Queux

No words of mine can express my absolute and abject amazement when I faced the man, whom I had seen lying cold and dead upon that gray stone slab in the mortuary at Dumfries.

My eye caught the customer who, on the entry of Olinto, had dropped his paper and sat staring at him in wonderment. The detective had evidently been furnished with a photograph of the dead man, and now, like myself, discovered him alive and living.