18 years after Rachel Antonio's disappearance, there's some new information from someone who's never spoken and who wasn't called to the inquest. Can this man help Rachel's parents, Cheryl and Ian?

A trip to the local pool. Three mysterious phone calls. A man accused of withholding information. The clue that unlocks the entire case could be somewhere in these events.

Rachel Antonio is seen walking along a road at 7pm, Anzac Day. About the same time, Robert Hytch leaves a party and  returns an hour later. What happened in the time he was away? That depends on who you ask.

For a year before she vanished, Rachel Antonio kept a makeshift diary. It was filled with things her parents knew nothing about, documenting her claims of an intense relationship with a handsome older lifeguard, Robert Hytch.

What happened to Rachel? And, after all this time, could there possibly be some new evidence out there waiting to be discovered?

A new series from The Courier-Mail’s investigative journalist David Murray, who looks into the disappearance of Rachel Antonio – a teenage girl who went missing in Queensland 18 years ago.