She saw the quick shadow of doubt, the eye-flash of indecision. So she reached quietly down and opened her pocket-book, rummaging through its contents for a moment or two. Then she handed Blake a folded envelope.

“You know his writing?” she asked.

“I’ve seen enough of it,” he retorted, as he examined the typewritten envelope postmarked “Montreal, Que.” Then he drew out the inner sheet. On it, written by pen, he read the message: “Come to 381 King Edward when the coast is clear,” and below this the initials “C. B.”

Blake, with the writing still before his eyes, opened a desk drawer and took out a large reading-glass. Through the lens of this he again studied the inscription, word by word. Then he turned to the office ’phone on his desk.

“Nolan,” he said into the receiver, “I want to know if there’s a King Edward Avenue in Montreal.”

He sat there waiting, still regarding the handwriting with stolidly reproving eyes. There was no doubt of its authenticity. He would have known it at a glance.

“Yes, sir,” came the answer over the wire. “It’s one of the newer avenues in Westmount.”

Blake, still wrapped in thought, hung up the receiver. The woman facing him did not seem to resent his possible imputation of dishonesty. To be suspicious of all with whom he came in contact was imposed on him by his profession. He was compelled to watch even his associates, his operatives and underlings, his friends as well as his enemies. Life, with him, was a concerto of skepticisms.

She was able to watch him, without emotion, as he again bent forward, took up the ’phone receiver, and this time spoke apparently to another office.

“I want you to wire Teal to get a man out to cover 381 King Edward Avenue, in Montreal. Yes, Montreal. Tell him to get a man out there inside of an hour, and put a night watch on until I relieve ’em.”