Erik woke up early, feeling restless from the previous day's events. His mind raced as he tried to recall every detail of that day.
He had followed the plan perfectly and was sure no one had seen him. But the photo that Hais had shown him had shaken him to the core. He made a mistake, and if someone saw the mask, it would be easy to link him to the murders if someone happened to see him with it.
Then, Erik thought back to the letter he had written to Logan. He realized now that it was a foolish mistake. He had been angry at Logan and wanted to push him to follow him, and he had written the letter in a fit of rage. It would be possible that the investigator found out he was the killer through it.
The problem was that he didn't know where the letter was. Logan could have thrown it away or kept it stored somewhere. However, it was clear that if he had done the latter, the police would have already found it.