Cheng Lei spent almost three years detained in China before being unexpectedly released last week.

Now back home, the Australian journalist is telling her story, describing the conditions she was detained in. 

Today, Dr Lavina Lee, a senior lecturer in security studies at Macquarie University on why China freed the mother of two now and what it wants in return. 

Featured: 

Dr Lavina Lee, senior lecturer in security studies at Macquarie University