The first decade 1920-1929 : unused ideas - one
Favourite stories and 'the man who knew'
The second decade 1930-1939 : unused ideas - two
'How I created Hercule Poirot'
The third decade 1940-1949 - unused ideas - three
Miss Marple and 'The case of the caretaker's wife'
The fourth decade 1950-1959 - unused ideas - four
Agatha Christie and poison
The fifth decade 1960-1969 : unused ideas - five
The sixth decade 1970-1976 : unused ideas - six
Agatha Christie's booklists.