Huh, I was just thinking about that story the other day. I see 'Codename: Anastasia' pop up on Wattpad sometimes, but it's not one single book—more like a whole subgenre over there, you know? It's usually about a girl, sometimes a secret princess or a hidden heir, getting pulled into some spy or royal conspiracy. The plot tends to be a mash-up of 'The Princess Diaries' but with way more danger and maybe a brooding bodyguard love interest.
Honestly, the specifics blur together after a while. There's always a big reveal about her true identity, a tense confrontation with the villains who want her dead or the throne for themselves, and a race against time. I read one version where Anastasia was a hacker instead of royalty, which was a fun twist. The main appeal is really the wish-fulfillment and the slow-burn romance layered over the life-or-death stakes.