Flower of the North by James Oliver Curwood

A dozen steps beyond the door Philip paused in the shadow of a dense spruce, half persuaded to return. From where he stood he could see Gregson bending over the table, already at work on the picture. He confessed that the sketch had startled him. He knew that it had sent the hot blood rushing to his face, and that only through a fortunate circumstance had Gregson ascribed its effect upon him to something that was wide of the truth. Miss Brokaw was a thousand or more miles away. At this moment she was somewhere in the North Atlantic, if their ship had left Halifax. She had never been in the north. More than that, he knew that Gregson had never seen Miss Brokaw, and had heard of her only through himself and the society columns of the newspapers. How could he explain his possession of the sketch?

He drew a step or two nearer to the open door, and stopped again. If he returned to question Gregson it would draw him perilously near to explanations which he did not care to make, to the one secret which he wished to guard from his friend's knowledge. After all, the picture was only a resemblance. It could be nothing but a resemblance, even though it was so striking and unusual that it had thrown him off his guard at first. When he returned later and looked at it again he would no doubt be able to see his error.