Lauren Bacall is amazing. She could play the serious roles, like she did with Bogart, but also comedies. I loved her in How to Marry a Millionaire.
The Thin Man movies (the first three are the best) are mysteries that center around Nick and Nora Charles, played by William Powell and Myrna Loy. They're lighter than a film noir, but the banter between Powell and Loy makes the film.
And, yay! I always wanted a birthday twin!