The Double Traitor by E. Phillips Oppenheim

Norgate had chosen, for many reasons, to return to London as a visitor. His somewhat luxurious rooms in Albemarle Street were still locked up. He had taken a small flat in the Milan Court, solely for the purpose of avoiding immediate association with his friends and relatives. His whole outlook upon life was confused and disturbed. Until he received a definite pronouncement from the head-quarters of officialdom, he felt himself unable to settle down to any of the ordinary functions of life. And behind all this, another and a more powerful sentiment possessed him. He had left Berlin without seeing or hearing anything further from Anna von Haase. No word had come from her, nor any message. And now that it was too late, he began to feel that he had made a mistake. It seemed to him that he had visited upon her, in some indirect way, the misfortune which had befallen him.

It was scarcely her fault that she had been the object of attentions which nearly every one agreed were unwelcome, from this young princeling. Norgate told himself, as he changed his clothes that evening, that his behaviour had been the behaviour of a jealous school-boy. Then an inspiration seized him. Half dressed as he was, he sat down at the writing-table and wrote to her. He wrote rapidly, and when he had finished, he sealed and addressed the envelope without glancing once more at its contents. The letter was stamped and posted within a few minutes, but somehow or other it seemed to have made a difference. His depression was no longer so complete. He looked forward to his lonely dinner, at one of the smaller clubs to which he belonged, with less aversion.