Three London schoolgirls disappear, heading for a war zone. Four years later only one emerges from the ashes of ISIS. Nobody knows what really happened to her. Josh Baker meets Shamima Begum in Syria to begin unpicking her story.

Almost eight years earlier, he was filming in Shamima’s local mosque when news broke that she and her friends had gone missing, it made global headlines. He was there when their families came asking for help, but it was all too late; they'd already made it into the hands of the Islamic State group.

But how did it all begin?

Reporter: Josh Baker Written by: Josh Baker and Joe Kent Producers: Josh Baker, Sara Obeidat and Joe Kent Composer: Firas Abou Fakher Theme music: Sam Slater Mix and sound design: Tom Brignell Production coordinator: Janet Staples Series Editor: Jonathan Aspinwall Head of Long Form Audio: Emma Rippon Commissioning Executive: Dylan Haskins

ARCHIVE Good Morning Britain (ITV, September 2021) Sky News: John Sparks interviews Shamima Begum (February 2019)