Jonah H-K... how does he get parts? Here he is, playing an extremely similar role to the one he had in World on Fire, i.e. a wet young upper-class Englishman in the 1920s-1940s. In neither role does he have a feeling for the period or an appropriate accent. Even if he were better, the script would still be anachronistic anyway. And Agatha herself is boring. It's also very slow. After a while I gave up and switched off.