Hanna is a 16 year-old girl raised and trained in isolation by her father, an ex-CIA agent. Eventually, she chooses to leave their home in the woods and when she does, it doesn't take long for some disreputable agents to start hunting her.
I found it fascinating to watch the irony of Hanna learning about things in the modern world (she freaks out a bit when watching TV), yet being so adept at survival. She does find friends along the way, and she does have a specific mission.
Naturally, most of the character development focuses on Hanna, her father, and Marissa, the woman hunting her.
There was plenty of action, and I especially admired how it was integrated into the story. It was not gratuitous.
Content warnings include some language, and violence. There was some blood in a couple scenes, but not as much gore.
A very captivating and entertaining movie.