Mark Dindal, the man who directed Chicken Little for Disney, has found a human-based project he likes enough to make the jump to live action directing. The film, Sherlock's Secretary, is based on the idea that people still write to Sherlock Holmes' address at Baker Street in London to ask him to solve crimes.
One day, the person who lives there finds a piece of mail so interesting that they decide to try and solve the crime themself. This is one of the best ideas for a movie that I've ever heard.
Dark Horizons.com: Dindal Books In With "Sherlock"