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Goodreads asked Andrew Warren:

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

Andrew Warren Since I was writing a prequel, I knew it would be set in Thailand, and I roughly knew where I wanted the protagonist to end up. I wanted a story that showed a cynical, bitter man realizing that unless he made some changes in his life, he might be heading down an even darker path. His experiences in Devil's Due set him up to begin the journey in Tokyo Black (Which is out to editors now.)

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