Since the series ended, so many of you have got in touch wanting to know more. With the help of criminal psychologist Dr Julia Shaw, Josh answers your questions.
Presenters: Josh Baker and Dr Julia Shaw (host of the Bad People podcast on BBC Sounds)
Mixed by: Tom Brignell
In Northern Iraq, Josh finds out how two people you’ve been asking about are doing now.
In 2014 the Islamic State group killed thousands of members of the Yazidi religious community and kidnapped and enslaved many, many more. Ayham and Saud were both taken from their families and ended up in...