David Wells was the Victoria Police Surgeon during one of Australia’s most disturbing unsolved crime sprees - the abductions and assaults of three young girls, and the suspected murder of a fourth, by the predator known only as Mr Cruel.

In this powerful and rare interview, Associate Professor Wells shares what it was like to examine the victims, the moment he returned a girl her parents believed was dead, and the vital evidence he uncovered that could still help unmask the man behind the mask.

This episode contains descriptions of child sex abuse, sexual assault, self-harm and violent crime. 

If you or anyone you know needs support, call Lifeline on 131 114, beyondblue on 1800 512 348, Kids Helpline on 1800 55 1800, or the National Sexual Assault, Domestic and Family Violence Counselling Service on 1800RESPECT (1800 737 732).

See omnystudio.com/listener for privacy information.