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By Death Divided is the 14th book in the Thackeray and Ackroyd Series by Patricia Hall.
"Rage overtook him like a foul fog, filling his mouth with bile and squeezing his chest like a vice, forcing breath from his lungs with a harsh rattle. There was never any warning. One moment he was calm and in control, and the next filled with this murderous madness, which he only half-remembered after it had abated."