Inside Story

Go on, admit it. We've all done it. Told the odd porky, gilded the lily, twisted the truth. But the people you'll meet in this episode do it on a whole different level - their entire lives are one big lie. They're are A-grade cheats and con artists and their frauds are so grandiose, so brazen, they will leave you shaking your head in disbelief.

They were born bad - very bad - teenagers who committed the most horrific of crimes and all captured on video. In Bargo south of Sydney, young David Auchterlonie went out to celebrate his 17th birthday with mates but never came home.

Caroline Reed Robertson's obsession would lead inexorably to tragedy because to become Rachel Barber she first had to kill her. For five years, Caroline Reed Robertson waited and secretly plotted - her diary full of entries about the girl with whom she was so totally and dangerously infatuated.

Inside Story is a current affairs television program hosted by some of Australia's finest reporters.

This is a story about dark secrets, strange rituals and murder.

In this episode you'll meet two extraordinary people who have done just that. And when you discover just how horrific, how pre-mediated, these murders were, it beggars belief that these people could ever forgive.

First, the story of Richard Giardina and Lisa Keem. He was the life of the party. She was searching for a soul mate. From the very first time Lisa met Richard, she knew he was different.