Read The Great Christmas Ball Storyline:
Lord Costain suspected there was a traitor in the Horse Guards where he worked. So he took the German message to a local interpreter, who turned out to be Cathy Lyman. She was surprised by the content and eventually found herself involved with her brother in espionage. But Cathy wondered whether handsome Lord Costain was the problem, or the solution? Regency Romance by Joan Smith; originally published by Fawcett CrestPages of The Great Christmas Ball :
