A Royal Marine walks out of a bar ... and disappears without a trace.

In 1980, Royal Marine Alan Addis walked out of a bar in the Falkland Islands and was never seen again – a mystery that has remained unsolved for more than 40 years.

In this true-crime documentary, Marcel Theroux revisits the case, using evidence left behind by Addis’s mother. But during his investigation into the young marine’s disappearance, he inadvertently uncovers other historic crimes on the island: multiple allegations of child abuse amid a culture of silence among the islanders.

Watch Secrets of the Falklands and more acclaimed documentaries on BBC Select today. Restrictions apply*.