Goodreads asked Sarah Sullivan:

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

Sarah Sullivan I'm never sure where the ideas come from. ALL THAT'S MISSING began with an image of a boy arriving at his grandmother's house for the first time. He was about 12 years old and, somehow I knew he had no memory of either his grandmother or the place where she lived. There was some family mystery he needed to solve. And, he was leaving an uncomfortable situation behind. That was all I knew. I had to write the book to answer all the questions this image raised in my imagination.

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