According to ESRB, this game contains: Blood, Mild Language, Violence
Parents are in the relative clear buying this for their teens. While violence occurs, and disturbing acts are discussed, for the most part, everything is kept tastefully offscreen.
Adventure gamers should definitely consider this game. It's a classic adventure game with a well written plot (there aren't enough of these being made right now, so it's a good idea to support them whenever you get the chance).
Deaf and hard of hearing gamers will be fine. All of the game's voluminous text is subtitled.