I Was Anastasia
This book sent me on a major Romanov rabbit trail, and I found myself reading everything I could about them. I knew nothing about the fall of the Russian Imperial empire before reading it, but I've learned a lot since! I found this book hard to put down, but also tricky to follow, so I'd recommend reading a paper copy (not an e-book or audio book) so you can flip back and forth when you need to clarify a date or a character.
This one has an intense scene toward the end, and I probably wouldn't hand it to a child under 18. This is not a feel-good-and-cozy read, either, so read it when you want a suspenseful page-turner that will make you think.
FROM THE PUBLISHER:
A young woman bearing an uncanny resemblance to Anastasia Romanov is pulled shivering and senseless from a canal. Refusing to explain her presence in the freezing water or even acknowledge her rescuers, she is taken to the hospital where an examination reveals that her body is riddled with countless horrific scars. When she finally does speak, this frightened, mysterious young woman claims to be the Russian grand duchess.