I had detected a hint of bitterness at the corners of his mouth as if he had a regret about something. This intrigued me. It was at odds with my understanding of his personality so far. As the weeks went by, the rest of his body – tensing, sitting straight up in his chair as he read, and then relaxing again only to shake his feet under the chair - and his face faded in the picture until only his lips remained. “Solve this,” the image seemed to say, and I did. (You can solve it too!) 

Then the rest of that one-on-one meeting fell neatly into place."