<p>A mysterious letter detailing a supposed plot by Islamic extremists to take over schools shocked Britain in 2014. But who wrote it? From Serial Productions and The New York Times, “<a href=“https://www.nytimes.com/interactive/2022/podcasts/trojan-horse-affair.html”>The Trojan Horse Affair</a>” is a mystery told in eight parts. Here’s the first. Find the series wherever you get your podcasts.</p>