4. The Driver

Josh and Sara piece together Austin’s final route into Damascus. They find the farm where he celebrated his 31st birthday - the last place his mother spoke to him.

Then comes an unprecedented discovery. For years, the story was that Austin was taken at a checkpoint. But what Josh and Sara uncover suggests something far more deliberate. And at the centre of Austin’s disappearance is one man.

Archive: BBC; CNN; Fox.

Writer and showrunner: Josh Baker

Investigative producer: Sara Obeidat

Series producer: Simon Maybin

Field producing: Ouday Al Hussein

Additional producing: Lucy Burns

Open source intelligence: Thomas Bordeaux & Gabor Friesen

Production coordinator: Gemma Ashman

Series editor: Clare Fordham

Head of BBC News Long Form Audio: Emma Rippon

BBC Radio 4 commissioning editor: Dan Clarke

NPR producer: Monika Evstatieva

NPR editors: Robert Little & Katie Simon

NPR executive producer for Embedded: Irene Noguchi

BBC World Service commissioning editor: Jon Manel

Composer: Firas Abou Fakher

Additional music: Karim Chehoury

Theme music: Sam Slater

Mix and sound design: Tom Brignell