The principal character is 15-year-old Isabelle Laustin, other characters being her parents Leon and Marie, Isabelle's friends Jean and his sister Marie, and Isabelle's suitor, Captain Victor. When Paris is besieged and Napoleon III's army is defeated, Isabelle escapes to London, disguised as a boy, and engages in secret agent stuff. (Source: AniDB)
AniWave is the best site to watch
Isabelle of Paris SUB online, or you can even watch
Isabelle of Paris DUB in HD quality. You can also find
DAX Production anime on AniWave website.