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. To learn more about upcoming episodes of METRO and get a look behind the scenes, find us on Instagram, TikTok, and Facebook by searching “Serial Productions”. Have a story pitch, a tip, or feedback? Email us at serialshows@nytimes.com. Hosted by Simplecast, an AdsWizz company. See https://pcm.adswizz.com for information about our collection and use of personal data for advertising.