"Before he was taken off the Derfflinger, our mysterious friend Charles asked the Admiral to give you his greetings the next time he saw you. We hoped that you might actually know him and could shed a little light on who he really is"
"I'm afraid not," she said, shaking her head.
---
"Between his transfer, he somehow managed to disappear".
One of the armsmen shifted position slightly but remained silent. "Interesting," Harrington said. "I'd like to meet the man". She looked over her shoulder at her armsmen. "I'd like it very much".
Other than the stories "With one stone" and "An act of war", are there any other places/stories in the Honorverse where he is either mentioned or makes and appearance?