DS Sean Stone's difficult manner alienates all those who work with him but his unorthodox methods could hold the key to finding a missing girl. Looking into a spate of teen suicides with missing person expert Ruth Hattersley, Sean believes he has discovered a serial killer is preying on vulnerable teens.

As the net closes in on the killer, the search for Taylor Davis takes an unexpected turn, Sean is forced to question his methods and faces a shocking surprise about the killer's identity.

Investigating the disappearance of a lawyer, DS Sean Stone is convinced he's found the third victim of a convicted killer, Leonard Vance, now incarcerated in a secure hospital, and Sean gets a confession for the lawyer's murder from Vance.

Leonard Vance dies from a heart attack. However, Sean is certain that he is innocent and the police seem to be too eager to tie-up the whole case.