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Goodreads asked Diane E. Tatum:

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

Diane E. Tatum We recently brought home my mother-in-law's cedar chest. Though my husband had the key, he put it inside the chest, unlocked, for the ride home in our car from Nashville. When he got it put in the place we wanted it, he discovered it had locked itself, somehow, on the ride home.
I actually used this idea for a time travel book this year, Cecilia's Y2Key.

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