Amanda Montell's father, Craig, grew up in the Synanon drug rehab church started by Charles Dederich. Montell's Cultish is a linguistic investigation of the dialect of cults that starts from her father's experiences and covers true cults, MLMs, culty gym culture, and social media gurus. In the fanatic cultural fabric of America, a couple of lessons on in-group language and thought terminators will vastly improve your cult radar.