"Cairo" (1942) is a typically polished MGM production - even if it does take place in an entirely Hollywood-studio Cairo. It features some surprising, for the time, "meta" humor, like Jeanette MacDonald's response to the question "Have you ever been to San Francisco?", or the final scene where she "teaches" Robert Young how to carry himself as an actor in front of a supposed camera - which is the actual camera filming them. There is perhaps a tad too much singing, although MacDonald, who looks gorgeous and younger than her age, has a remarkable voice. A fine supporting cast helps. **1/2 out of 4.