DS Sean Stone (Reece Shearsmith) is intense and socially awkward, a misfit who is happier dealing with data rather than people.

His lack of people skills and forthright honesty make him some powerful enemies in the force, and he finds himself exiled to missing persons.

Sean's new caseload is overwhelming - up to 300,000 people go missing in the UK each year - but his brilliant mind turns out to be perfectly adapted to his new role.

Where others see a hopeless, ever-growing sea of lost faces, Sean spots patterns that lead to victims... and their killers.

Ruth Hattersley (Alex Kingston) is the analyst from the Missing Persons Bureau tasked with working alongside Sean.

She puts people first - a born connector able to get on with anyone, but Sean pushes even her patience to breaking point.

DCI Pryor (Noel Clarke) has ambitions and a clear plan for rising up the ranks, but all this is jeopardised when DS Stone becomes his responsibility.


1	"Only Connect: Part One"
After criticising police procedure in the aftermath of a murderer's capture, awkward and unorthodox DS Sean Stone is permanently seconded to the Missing Persons Bureau with analyst Ruth Hattersley.

The case of a vanished 16-year-old girl soon has him back out in the field, and looking into a spate of teen suicides after discovering the teen had links to a suicide forum.

He believes he has discovered a serial killer preying on vulnerable youngsters.



2	"Only Connect: Part Two"
After criticising police procedure in the aftermath of a murderer's capture, awkward and unorthodox DS Sean Stone is permanently seconded to the Missing Persons Bureau with analyst Ruth Hattersley.



3	"Off Radar: Part One and Part Two"
DS Stone looks into the case of Stephen Eli, a lawyer and single father who fits none of the five most common categories of missing persons.

Serial killer Leonard Vance, incarcerated in a psychiatric hospital, is a new suspect when Sean spots a connection with the killer's two victims.

Vance later confesses, but fails to guide police to Eli's body and later dies from cardiac arrest.

Sean starts to believe that somebody else is responsible for not only Eli's death, but also the other murders supposedly committed by Vance, and finds a pattern with all supposed three victims.