Sally Magnusson presents a series that goes behind the scenes at police forces' Missing Persons Units across the UK and looks at baffling cases from the National Missing Persons Helpline. Two teenage sisters walked out after a family argument at home and haven't been seen since.
Their mother is bringing them up alone and frantic with worry, she’s reported them missing to the police. Police are concerned that they might have fallen into the wrong hands. Will the search for the sisters spread to the continent?

Plus, the story of David McCallum, a happy-go-lucky family man from Glasgow who went out for a drink in 2003 and never returned. Twenty four hours later he answered his mobile - sounding disorientated - and told his sister he was walking through trees. Days later David’s car was found abandoned on the banks of Loch Lomond. Show less