When a young man wakes up bruised, beaten and with no memory of who he, the press immediately dub him 'The Lost Man'. Ten months later Richard Kite remains as desperate as ever. Despite appeals and the efforts of the police, no one knows this man. Kite's last hope may be private investigator David Raker. But Raker has more questions than answers. Who is Richard Kite? Why does no one know him? And what links him to the body of a woman found beside a London railway line two years ago?

It's a night just like any other in the Conister home - but then Paul heads upstairs and never comes back. When his wife, Maggie, goes to see where he is, she can't find him. His phone and wallet are by the bed. The windows are locked from the inside. Paul has vanished. Missing persons investigator David Raker is an expert in locating the lost. So when he's hired by Maggie, he knows that in every disappearance - however impossible it seems - there's an answer. What he doesn't know yet is that his search for Paul Conister will become linked to three other mysteries.

Exhausted single mother Rebekah Murphy leaves her daughters with a friend in the city to accompany her brother on a work assignment on a picturesque island. An hour after arriving, her and her brother are attacked. He vanishes, she's left for dead and, by the time she makes it back to safety, it's already too late: the island has closed for the season - and it'll be seven months before anyone returns. But even with her brother missing, even with no boats, phones or people, Rebekah will soon realise that finding a way back to the mainland is only the start of her nightmare.

When a toddler goes missing in the middle of a bustling Bradford park in broad daylight, Detective Daniel Ward is put on the case. It ought to be an open and shut investigation, but the hours tick by, and Millie Thompson is nowhere to be found. There’s only one conclusion DI Ward can come to: She was taken. When a known child-killer is spotted in the vicinity, Ward fears the worst. He has to catch up with the only lead he has before the infamous Hunters - merciless vigilante justice seekers who will seek retribution at any cost - catch up with his suspect first.

Was the biggest case of his career the worst mistake he ever made? Ten years ago, DCI Jack Logan stopped the serial child-killer dubbed "Mister Whisper", earning himself a commendation, a drinking problem, and a broken marriage in the process...When another child disappears a hundred miles north in the Highlands, Jack is sent to lead the investigation and bring the boy home. But as similarities between the two cases grow, could it be that Jack caught the wrong man all those years ago?

When the remains of a young woman are discovered near to Branodunum, a Roman archaeological site on the Norfolk coast, DI Tom Janssen and his team must work to discover who she was and how she came to be buried there. The area is steeped in myth and folklore, a site excavated many times over the years. Just how long has she lain there...and who wishes she'd never been discovered? As the victim’s life comes into sharp focus, it appears there is far more to those who crossed her path than anyone previously realised.

A family is gunned down in the snow, but one of the children survives. Three years on, that child takes revenge, and the Snow Killer is born. But then, nothing - no further crimes are committed, and the case goes cold. 50 years later, has the urge to kill been reawakened? As murder follows murder, the detective team tasked with solving the crimes struggle with the lack of leads. It’s a race against time and the weather - each time it snows, another person dies.

Haunted by his inability to track down and save his missing wife, DCI Robert Kett leaves the Metropolitan Police behind and moves to Norwich with his three young children, hoping to heal their broken family. But his newfound peace doesn’t last. Two newspaper delivery girls have gone missing in the city, and the clues point to a serial kidnapper. Kett is dragged into the centre of one of the darkest cases of his career - a case that pits him head-to-head against a horrifying evil.

Former soldier. Ex-copper. Current man on the edge. Shunned by his old colleagues, and dividing his time between a dead-end job and the bottom of a whisky bottle, former Police Scotland detective superintendent Bob Hoon’s life is a mess. Then an old face from Hoon’s Special Forces days turns up asking for help: His teenage daughter has been missing for months, the police have drawn a blank, and he needs the kind of help that only Hoon can provide. And besides, Hoon owes him one.

It was meant to be a harmless stag-night prank. A few hours later Michael Harrison has disappeared, and his friends are dead. With only three days to the wedding, Detective Superintendent Roy Grace - a man haunted by the shadow of his own missing wife - is contacted by Michael's beautiful, distraught fiancée, Ashley Harper. Grace discovers that the one man who ought to know Michael Harrison's whereabouts is saying nothing.

How can a child vanish without a trace? Last night, eight-year-old Daisy Mason disappeared from a summer party at her home. No-one at the party noticed her leave. Even her parents aren't sure of the last time they saw her. DI Adam Fawley is trying to keep an open mind. But he knows that in nine cases out of 10, it's someone close to the victim. When a pair of bloody tights is discovered, Fawley's worst suspicions are concerned. Someone knows where Daisy is. And her time is running out.

The brutal murder of 10-year-old Callum Bradley sent shockwaves across Scotland, but as the weeks have stretched on with no solid leads, the investigation has been scaled back. Sergeant Don Colyear, community police officer, is tasked with tying up a loose end: a 999 call which may have hinted at the boy's murder. However, the call was made three weeks before the crime took place. The caller turns out to be a resident at an Edinburgh care home, drifting in and out of lucidity due to dementia - enough to write off the potential lead as a dead end. 

Police officer Sebastian Clifford never planned on becoming a private investigator. But when a scandal leads to the disbandment of his London based special squad, he finds himself out of a job. That is, until his cousin calls on him to investigate her husband’s high-profile death, and prove that it wasn’t a suicide. Clifford’s reluctant to get involved, but the more he digs, the more evidence he finds. With his ability to remember everything he's ever seen, he's the perfect person to untangle the layers of deceit.

A band of vigilante executioners roam London's hot summer nights, abducting evil men and hanging them. Sentenced to death is the gang member who abused vulnerable girls, the wealthy drunk driver who mowed down a child and the hate preacher calling for the murder of British troops. As the bodies pile up and riots explode all over the sweltering city, DC Max Wolfe embarks on his most dangerous investigation yet: hunting a gang of killers whom many believe to be heroes....

Criminologist Martin Knight lives a gilded life and is a thorn in the side of the police. But then his wife, Liz, goes missing. There is no good explanation and no sign of Martin.... To make things worse, Liz is the ex-girlfriend of DCI Craig Gillard who is drawn into the investigation. Is it just a missing person or something worse? And what relevance do the events around the shocking Girl F case, so taken up by Knight, have to do with the present? The truth is darker than you could ever have imagined.