Goodreads asked Wen Spencer:

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

Wen Spencer I happened to have a discussion with a friend who had invitro fertilization. She had twins boys but later she gotten a call from the clinic wanting to know if she wanted to use the embryos stored. She decided not to and donated them. She knows that at least one child was born from the donated material, a full sister to her twins. A few days later I dreamed about Louise trying to save her baby siblings and woke up realizing that Tinker WOULD have siblings.

I thought that only someone that had a very close and loving relationship with a sister or brother would go through hell to save an unborn sibling, so I decided to create the twins. I also thought only someone with the very idealistic but somewhat impractical viewpoint of a child would face hell and high water to attempt the impossible. I set the twins age at nine because to me that's about the time that kids go from totally idealistic to a more adult and realistic viewpoint.

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