<p>In a bonus episode of Intrigue: The Ratline, Stephen Fry interviews Philippe Sands in front of an audience at the BBC Radio Theatre in London. They discuss a range of issues brought up by the series including historical responsibility and the nature of evil. Plus as a special extra, there is a full version of The Ratline theme music by Catrin Finch and Sekou Keita.</p>

Tunnel 29: Trailer

Twenty-five years on from the deadliest terror attack in history, BBC investigative journalist Jane McMullen asks why thousands of grieving families are still fighting for answers.  
 
In early 2000, two young Saudis arrived in San Diego. They had never been to America, spoke almost no English, and had no idea how to open a bank account or rent a flat. Within weeks they had done all of it. Twenty months later they hijacked a plane and crashed it into the Pentagon. 
 
McMullen investigates the hidden story of a man who helped two of the hijackers - and reveals a story that the US and Saudi governments have fought to keep secret.