In an article in August's Writing Magazine John Curran tantalisingly recalls discovering a cardboard box full of Agatha Christie's notebooks on a visit to Greenway House prior to its hand-over to the National Trust. It took him over a year deciphering and transcribing her scribbled notes into 73 individual Word documents.
What struck him was their chaotic nature and lack of chronology, suggesting that several were in use at once. It led him to conclude that where ever she was at the time, she must have grabbed whatever notebook was closest to hand to jot down the thought or plot point which had popped into her head.
I know the problem! Having forgotten a gem of an idea before now, between the blinding flash and arriving downstairs in search of a notebook to write it down, I now have several notepads, strategically placed around the house.
I haven't yet found myself a version that I can use in the shower (where many of my better (?) ideas come to me) but I believe there is such a thing available...
John Curran's books:
Agatha Christie's Secret Notebooks
Agatha Christie's Murder in the Making