"address unknown" is surprisingly intriguing. As it started, I was expecting it to be a childish, amateurish, teenage spy spoof, but it wasn't. This film was actually smart. The writers actually took time out to develop their main characters genuinely instead of seeming like they had to. My only complaints are; I wish the parents were more involved in the story and the movie seems to shy too far away from the plot to focus on the characters. I found myself forgetting what the movie was about because of that. But all-in-all, the film is smart, the characters are interesting and funny, and the plot seems well-thought up. ***. A fun teen-sleuth film.