J.K. Rowling first had the idea for Harry Potter while delayed on a train travelling from Manchester to London King’s Cross in 1990. Over the next five years, she began to plan out the seven books of the series. She wrote mostly in longhand and amassed a mountain of notes, many of which were on scraps of paper. She arrived in Edinburgh in 1993 with three chapters of Harry Potter and the Philosopher’s Stone in her suitcase.