Dr Heidi Kastner, Forensic Psychiatrist

Dr Heidi Kastner is the forensic psychiatrist who had to assess the mental state of Josef Fritzl, the Austrian convicted earlier this year of imprisoning and raping his daughter over a 24 year period.

This week on The Interview Dr Kastner tells Carrie Gracie about the challenges of her job - the curiosity which took her into the field and the occasional sense of helplessness that her job inflicts on her.