America's leading cult expert exposes how notorious cults including NXIVN, Branch Davidians, and Scientology use psychological tactics to capture the mind--and what it takes to break their hold What makes someone vulnerable to a cult mentality? How do cult leaders evade prosecution? Is MAGA a cult? For forty years, cult intervention specialist Rick Alan Ross has been reversing the work of narcissists, sadists, and some of the world's most dangerous minds, one victim at a time. With nuance and chilling clarity, Ross recounts the human cost of indoctrination and the toll it took on his own life--from death threats and stalking to a lifetime of lawsuits. With more than 500 cult interventions, Ross has witnessed some of the most shocking examples of psychological manipulation and abuse in recent history, including: Serving as an onsite consultant for the Waco Branch Davidian standoff Advising the FBI on David Koresh and his inner circle Withstanding a 15-year, $5 million legal challenge from NXIVM "sex cult" founder Keith Raniere and later testifying at Raniere's criminal trial Performing the first on-air cult deprogramming on 48 Hours for a 14-year-old survivor of Potter's House In this blow-by-blow account, Ross exposes how the machinery of coercive persuasion methodically strips away critical thinking for even the brightest minds--and the effective methods he uses to break through programming and restore autonomy. Both a true crime chronicle and a field guide to psychological manipulation, Deprogrammer offers an urgent, unflinching look at how ordinary people fall prey to cults, and how one man spent his life relentlessly and patiently towing them to safety.