What happened to the girl Shamima Begum says convinced her to join the Islamic State group?Less than 24 hours before this episode was published ,we got the answer. Reporter: Josh BakerWritten and produced by: Josh Baker, Sara Obeidat and Joe KentComposer: Firas Abou FakherTheme music: Sam SlaterMix and sound design: Tom BrignellProduction coordinators: Janet Staples and Helena Warwick-CrossSeries Editor: Jonathan AspinwallHead of Long Form Audio: Emma RipponCommissioning Executive: Dylan HaskinsThis episode contains some strong language