A strange letter appears outlining a plot by Islamic extremists to infiltrate Birmingham schools. Hamza and Brian visit the supposed mastermind of the plot, and he tells them he did take over a bunch of schools – just not for the reasons in the letter. Our newest podcast, “The Preventionist” is out now. Search for it wherever you get your podcasts. To get full access to this and other Serial Productions and New York Times podcasts on Apple Podcasts and Spotify, subscribe at nytimes.com/podcasts. To find out about new shows from Serial Productions, and get a look behind the scenes, sign up for our newsletter at nytimes.com/serialnewsletter. Have a story pitch, a tip, or feedback on our shows? Email us at serialshows@nytimes.com