Goodreads asked Kyra O'Reilly:

Where did you get the idea for your most recent book?

Kyra O'Reilly My sister (who wrote 'Switch' with me) and I were talking about deja vu theories, and the idea of it being because you are doing the same thing as your doppelganger in a parallel universe just came into our heads. The whole story just grew from that single thought.

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