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 arrest the Marquis in France.

So unless you or I can get on his track—"

The Doctor was still smiling in the most friendly way, and his protected eyes were still impenetrable. The Professor signalled to Syme that he would resume his explanation, and he began again with the same elaborate calm.

"Syme immediately brought this information to me, and we came here together to see what use you would be inclined to make of it. It seems to me unquestionably urgent that——"

All this time Syme had been staring at the Doctor almost as steadily as the Doctor stared at the Professor, but quite without the smile. The nerves of both comrades-in-arms were near snapping under that strain of motionless amiability, when Syme suddenly leant forward and idly tapped the edge of the table. His message to his ally ran, "I have an intuition."

The Professor, with scarcely a pause in his monologue, signalled back, "Then sit on it."

Syme telegraphed, "It is quite extraordinary."