A mysterious letter detailing a supposed Islamist plot to take over schools shocked Britain in 2014. But who wrote it? From Serial Productions and The New York Times, “The Trojan Horse Affair,” an investigation that became bigger than we ever imagined. All eight parts are coming next Thursday, February 3rd.

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.

Hamza and Brian think the source of the Trojan Horse letter might be hiding in plain sight. After learning about the petty personnel dispute that probably gave rise to the letter, they’re even more bewildered about how it ever could have been taken seriously.

In a state of surprise, Hamza and Brian leave a meeting with the man the Trojan Horse letter was first sent to. And they learn about an internal investigation report that local officials have kept hidden, but which they think could contain a bombshell.

A series of frustrating interviews with Birmingham politicians leaves Brian and Hamza wondering if crucial information about the Trojan Horse letter was kept from officials in London. Then one rainy Friday afternoon, Brian hears back from a government source who wants to meet right away.

Hamza and Brian learn that the Trojan Horse letter wasn’t the only unsigned letter alleging an extremist operation was afoot in Birmingham. An interview with a couple who lodged complaints against their school starts out cordially, but six hours later, the atmosphere is so tense that not even an offer of tea can smooth things over. And Hamza stops pretending he’s not angry about what he’s hearing.

Hamza takes a long, hard look at what the government found when it investigated more than 20 majority-Muslim schools in Birmingham. And our two reporters have a confrontation – with each other.

Birmingham authorities struggle to explain why they disavowed their own findings about the Trojan Horse plot. But when Brian and Hamza make a discovery deep inside some court documents, everything suddenly makes sense.

A man banned from working in education in the aftermath of the Trojan Horse letter inspires Brian and Hamza to track down one last witness with him – in Australia. And all three travelers find their faith tested.