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The Flame Alphabet (edition 2012)
by Ben Marcus
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Marcus creates a chilling world where the speech of children is killing their parents. After being forced to leave their daughter Esther to fend for herself, Sam and Claire end up at a government lab intent on creating non-lethal speech. But when Sam discovers the truth about what's going on there, he realizes reuniting with his daughter is the only way to keep his sanity.
(summary from another edition)