Chasing Shadows

DS Sean Stone is demoted after criticizing police procedure in a recent case, but his back out in the field when a 16-year-old girl goes missing.

While investigating the disappearance of a teenage girl, DS Stone discovers she was a member of an online social network linked to several suspected suicides.

Missing persons expert Ruth Hattersley and DS Sean Stone visit an incarcerated serial killer who is a suspect in the disappearance of a solicitor Stephen Eli.

As far as the police are concerned, Steven Eli was killed by Leonard Vance - but Sean is not so sure.