If you've already read about conspiracy theories much before, Ian Dunt and Dorian Lynskey's Conspiracy Theory doesn't offer a lot that's new. They try to tackle the history of conspiracy theories, the psychology of why we believe them, and also what can be done about them, which is a big ask in a small space.

The history manages to be reasonable thorough, or that's my impression: I only vaguely knew about the original actual Illuminati, and there were aspects of historical USian conspiracy stuff that I didn't know a lot about. It discusses Kennedy's assassination, of course, but also more recent stuff like Pizzagate: it's definitely modern and relevant, though feels slightly weird that it doesn't address Trump's new presidency and what that might mean for conspiracy theories (which is not the book's fault, to be clear -- it was released only just after the US election).

In a way, that fact makes the book feel defeated right away once we get onto the stuff about what to do about conspiracy theories, to be honest. How can one focus on deplatforming people who spout conspiracy theories when Trump's about to be president again? The chapter on defanging conspiracy theories is also quite short, because I think if that was the problem you want to solve... you wouldn't want to start from here. 

Ultimately, it was interesting but didn't really add much for me. Rob Brotherton's Suspicious Minds (which the authors reference) is better and more in depth.