Who killed Thelma Todd? This Halloween we reopen the case of this famous hollywood actress and restaurateur and investigate the most popular theories, from the mob to a jealous lover to even her closest relatives. We'll taste American cheese, and we'll speak with food writer Adam Gopnik about salt. Then we'll head into the test kitchen to uncover the secrets to making the best Black Bean Burgers. And of course, we'll be taking your calls to answer all of your cooking questions.