Ian Fleming, in an essay on writing thrillers, published in 1963:

We thus come to the final and supreme hurdle in the writing of a thriller. You must know thrilling things before you can write about them. Imagination alone isn’t enough, but stories you hear from friends or read in the papers can be built up by a fertile imagination and a certain amount of research and documentation into incidents that will also ring true in fiction.

The whole thing is worth a read.

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