Nope. That little demon-looking child is called a "Little Sister." She walks the halls of the underwater city, known as Rapture in search of Atom. Because she's just a little girl with a needle, she needed a protector. His name is "Big Daddy" and those who mess with the sister.... Spoiler: Don't last long ETA: Fixed image. Ah, same. I've been looking for a novel series with a similar feel but so far haven't been lucky.