Goodreads asked Christien Boomsma:

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

Christien Boomsma The way I get my ideas most of the time: I see something and get triggered by the situation and start wondering: what if?
In this case it was the smartphone I saw lying on a bench, very early in the morning. It may have been forgotten, by someone, but that would be very careless indeed. So... what if it wasn't simply forgotten? What if the owner of the phone had been kidnapped or something. And what if I would pick up the phone and hear someone beg: 'Please help me?'
From that point on, the story 'Schaduwloper' begins to unfold.

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