“Doctor!” the young man shouted.

“Yes, Estabrook,” said I; “keep your nerve. I think I have the key to this problem in my possession. I have not yet explained. I did not want to do so unless it was necessary. But if I am right you must not weaken. You must be ready to throw your whole strength into loyalty and affection for your wife and courage to protect her at any cost!”

“I’m ready!” he cried. “I feel that I must win her all over again. She is as fresh and new and beautiful to me as the day I first saw her. And I love her now as never before!”

“Jump into the car, then!” I commanded, and turning to my chauffeur, whispered, “To the Marburys’. Where we were this morning. And what—we—want—is—speed!”

He nodded, but I have no doubt that Estabrook and I both cursed him for his caution as he slowed down at the crossings, and finally, when, to conform to the traffic regulation, he circled in front of the banker’s house.

This time neither of us looked up at either residence, but ran forward toward the Estabrooks’ door. I pressed the bell centred in the Chinese bronze.

Suddenly, however, the unfortunate husband grasped the arm of my coat.

“My promise!” he exclaimed.

“You mean to keep it at any cost?”

“Yes,” said he. “I trusted her judgment and her loyalty, and gave her my word.”