Poisonous People

By Leanne ten Brinke

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A relatively small number of people drag everyone else down, argues award-winning psychologist Leanne ten Brinke, who has studied dark personalities for decades in prisons, schools, financial boardrooms and even the United States Senate. Her examples include a romantic partner who distorts every exchange, a bully at work who keeps rising, and a reckless relative who never accepts blame. Combining new science with storytelling, she explains how to spot such people, how they do so much damage, how to avoid becoming a target, how to head off bad behaviour and how to decide whether to leave. She frames the book as a set of evidence-based tools for limiting their harm.

Adam Grant listed it in The New Books to Refresh Your Thinking in 2026, describing it as a guide to spotting, avoiding and defusing narcissists, psychopaths and Machiavellians.

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Adam Grant (Author)

How to recognize, avoid, and neutralize narcissists, psychopaths, and Machiavellians.

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Leanne ten Brinke