Goodreads asked Jon Frankel:

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

Jon Frankel It was the combination of two ideas. One was a story I read in true crime book, The World's Worst Women called The First Acid Bath Murders, about the sisters Katherine and Philomene Schidt and a murderous lawyer Alexander Serrat. In the 20's they took out life insurance policies on people and killed them, dissolving the bodies in acid. The other was an idea for a sci fi book about genetic mutants who clone themselves and rule the US as a military, aristocratic caste, where wealth is literally in the blood.

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