"Did she meet anyone?" demanded Williams.

"Not a soul, sir. Said she just wanted to drive through the country and that she had to be at the Senate Office Building at twelve o'clock."

"The Senate Office Building?" echoed the operative. "At midnight? Did you drop her there?"

"I did, sir. She told me to wait and she was out again in five minutes, using the little door in the basement—the one that's seldom locked. I thought she was the wife of one of the Senators. Then I drove her to Union Station to get her bag, and then to Brickley Court, where she paid me and got out."

The moment the chauffeur had mentioned the Senate Office Building a mental photograph of Senator Lattimer had sprung to Williams's mind, for the affair between the countess and the Iowa statesman was public property.

Telling the chauffeur to wait in the outer room, the operative called the Lattimer home and insisted on speaking to the Senator.

"Yes, it's a matter of vital importance!" he snapped. Then, a few moments later, when a gruff but sleepy voice inquired what he wanted:

"This is Williams of the Secret Service speaking, Senator. Have you any documents of importance—international importance—in your office at the present moment?"

"No, nothing of particular value. Wait a minute! A copy of a certain report to the Committee on Foreign Relations arrived late yesterday and I remember seeing it on my desk as I left. Why? What's the matter?"

"Nothing—except that I don't think that report is there now," replied Williams. "Can you get to your office in ten minutes?"