The Egyptian Assignment
Really a two-part adventure. In the doghouse over the American mission failure, the Countess is dispatched to help Baron von Rautenfels, a man she had never met but heard bad things about, deal with shipping in Scandinavia. That man had a goofy plan to create explosives made to look like routine objects like "pieces of coal or cakes of tobacco" and send them, somehow, to worthy targets. Even as she ponders this matter, she recollects a mission to Egypt to organize resistance to England in that British-controlled region.