As he found that he could not sleep, he chose to take a walk somewhere in the huge mansion, as if trying to clear his mind and exhaust himself before going back to his room. He thought that by doing that, he could go into slumber easily.
He wanted to walk in the garden that became a treasure for her, but he chose to walk in another direction, as she had agreed to be his companion to stroll in the garden, and he waited for that.
After taking many minutes walking around in which he could not remember which direction he had passed, as his mind refused to be clear, he planned to go back to his room. However, he did not go back to his room. Instead, he found himself standing in front of a closed door that was unlikely to open for him to enter.