It seems on the face of it the oddest proposition on earth. David Fincher, the famous Hollywood director of Fight Club and Seven, has made a telemovie, simply called Mank, about Herman Mankiewicz who co-wrote the script for Citizen Kane with Orson Welles, shared the Oscar with him and according to a famous article by Pauline Kael deserves the lion’s share of the credit for the unforgettable dramatic story it tells from go to Rosebud.