S1, E1: New four-part crime thriller series, focusing on the work of a missing persons unit. DS Sean Stone has a difficult manner which tends to alienate all those who work with him, but his unorthodox methods could hold the key to finding a missing 16-year-old girl called Taylor. In order to examine a spate of teenage suicides, he is teamed up with missing persons analyst Ruth Hattersley. In spite of his initial misgivings, they learn to work together and Sean believes they have discovered a serial killer who is preying on vulnerable young people.