The crime writer on actor Frances Farmer’s life-changing story of survival, her favourite self help and discovering Agatha Christie’s alter ego

My earliest reading memory
I was six, and in the lounge in my first home in Manchester. I was sitting cross-legged on the grey carpet, in 1977, when I finished reading whichever of Enid Blyton’s brilliant Secret Seven mysteries contains the mind-blowing (genuinely, for a six-year-old) twist that “Emma Lane” turns out to be a road and not a person.

My favourite book growing up
Up to the age of 12, Blyton’s Secret Seven and Five Find-Outers mysteries; from 12 onwards, it was Agatha Christie. Growing up, I was certain that no other kind of story could ever hope to be as satisfying as the very best mystery story.