We lie to protect ourselves or others. We lie to avoid consequences. We lie to be cruel. Sometimes, we lie just because we can. Chris Taylor talks to three people who detect lies for a living – crime and corruption reporter Matthew Condon, Gold Walkley–award winning investigative journalist Kate McClymont and forensic psychiatrist Dr Calum Smith. They reflect on the crimes they’ve solved, the scandals they’ve exposed and the discoveries they’ve made about the inner workings of the deceitful mind.