Helen McCourt's mother, Marie McCourt, knew something was wrong when her daughter didn't return home from work. Her husband thought her train might just have been delayed by the bad weather, but everyone who knew Helen could tell you she always phoned if there was something holding her up. Something bad had happened, there was no doubt about it. Someone is reported missing every 90 seconds. Each episode of When Missing Turns to Murder features one case as it reveals powerful and emotional testimony from families and friends of those who have disappeared. Every story intimately shares the moment when a family changes forever – when a missing persons enquiry turns into a murder investigation. As each programme unfolds police and authorities investigate and bring the perpetrators to justice.