Myrna Loy and Fi

I admit that I am not as up on classic movies as I should be. Citizen Kane? I’m there. Metropolis. Absolutely. Alfred Hitchcock. Of course.
But I can only see and know so much. In his Amber the Eternal City, Arref has long since “casted” Fiona as Myrna Loy. I knew who she was, but could never figure out why.
Until he, in a recent blog entry showed this picture from a movie he is certain is “Mask of Fu Manchu”
Now I want to see this movie.