Say cheese! Our heroes in this week's episode are solving mysteries involving photographers and the photos they've taken. First, Casey, Crime Photographer hunts for picture-perfect proof of a killer's identity in "Murder in Black and White" (originally aired on CBS on March 18, 1948). Then, a nightclub photographer is marked for death in Richard Diamond, Private Detective (originally aired on NBC on August 9, 1949). And finally, George Valentine is tricked into a blackmail scheme where the blackmailer ends up dead in "Picture with a Black Frame" from Let George Do It (originally aired on Mutual on May 8, 1950).