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Goodreads asked Nicholas Graham:

What mystery in your own life could be a plot for a book?

Nicholas Graham I have an occasional doppel-ganger. Or perhaps I should say I am the occasional doppel-ganger of whoever this other person may be?
I've been mistaken for him on a number of occasions. Some years ago my then-girlfriend mistook him for me (in a public context, quite embarrassingly).
I have set eyes on him myself only once - many years ago, while I was walking down Madingley Road towards Cambridge he cycled past me heading in the direction of my lodgings. We stared at each other in wordless astonishment.

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