This new series sees journalist Donal MacIntyre revisit so-called missing person 'cold cases' which have never been closed and have never had successful convictions, this time looking at the case of Trevor Deely. Trevor was twenty-two when he vanished from the streets of Dublin in the early hours of December 8th, 2000. His disappearance was the subject of a high-profile search and publicity campaign, but no trace of him was ever found.

After his work Christmas party, Trevor went back to his office, in the Bank of Ireland, to collect a golf umbrella. It was a wet and wild night and there was a taxi strike in Dublin. He started his walk home around 3.45am, called his best friend and left a message on his phone. Shortly after, he was recorded on CCTV. That was the last time he was sighted. So what happened to him after that? How could he just disappear?