Looking straight into her face, I said:

“I’m here to warn you of a very grave personal danger.”

“You are really most alarming, Mr. Garfield,” she said in suspicion. “In what danger am I?”

“You are either in possession of some ugly fact concerning Mr. De Gex which he desires suppressed, or else you bar his way to some ambitious achievement.”

Her face changed, and she held her breath. Though it was only for a second I saw that what I had suggested was the truth. Her slim white hand twitched nervously upon her lap.

“Some fact concerning Mr. De Gex!” she gasped in feigned surprise. “Who told you that!” she asked, her face blanching.

“I have not been told. But I know it, Mrs. Cullerton,” was my reply. “I know that, though De Gex is assisting your husband out of a financial difficulty and pretends to be your good friend, he views you as his bitter enemy—as a person whose lips must, at all hazards, be closed.”

“Really, Mr. Garfield, what you say is too extraordinary—too amazing! I don’t understand you!”

“I know it sounds most extraordinary,” I said. “But first tell me if you know a certain Doctor Moroni, who lives in the Via Cavezzo?”