<p>The criminal charge sheet against senior Nazi Otto Wachter. Whilst Charlotte Wachter and her children were spending the summer in Zell am See, Otto was in Lemberg overseeing the 'Grosse Aktion' - the mass deportation of Jews to concentration camps. Philippe Sands interviews two Nazi hunters from the US Department of Justice to go through the evidence against Otto. Meanwhile Otto's son Horst continues to maintain his father's innocence. 
Producer: Gemma Newby
Sound design: Neil Churchill
Research: James Everest and Lea Main-Klingst
Original music by Catrin Finch and Sekou Keita
Otto Wachter: Stephen Fry
Charlotte Wachter: Laura Linney
Other parts by members of the BBC Radio Drama Company</p>

The Ratline: 4. Where's Otto?

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.