When a woman's body is found in the grounds of a ruined priory, Detective Imogen Evans realises she is dealing with a serial killer - a killer whose victims appear to die in a state of bliss, eyes open, smiles forever frozen on their faces.

Two years ago, Julia lost her family in a tragic accident. Her husband drowned trying to save their daughter, Lily, in the river near their rural home. But the little girl’s body was never found - and Julia believes Lily is somehow still alive. Alone and broke, Julia opens her house as a writers’ retreat. One of the first guests is Lucas, a horror novelist, who becomes obsessed with finding out what happened to Lily. But within days of his arrival, the peace of the retreat is shattered by a series of eerie events.

For four years Jessica has never doubted that her sister Isabel’s death was an accident. But when Jessica’s young daughter seems to know long-forgotten details about her aunt’s past, Jessica can’t shake the feeling that there’s a more sinister truth behind the tragedy. As Jessica unearths disturbing revelations about her sister, and about the people she loved and trusted most, it becomes clear Isabel’s life was less than perfect and that Jessica’s might also be at risk.

It was the job she had dreamed of since childhood. But on her very first day, when an unnerving encounter drags up memories Sophie Greenwood would rather forget, she wonders if she has made a mistake. A fatal mistake. What is her ambitious young assistant really up to? And what exactly happened to Sophie's predecessor? When her husband and daughter are pulled into the nightmare, Sophie is forced to confront the darkest secrets she has carried for years.

When a woman's body is discovered in a cathedral and hours later a young man is found hanging from a tree outside his home, Detective Lottie Parker is called in to lead the investigation. Both bodies have the same distinctive tattoo clumsily inscribed on their legs. It's clear the pair are connected, but how? The trail leads Lottie to St Angela's, a former children's home, with a dark connection to her own family history. Suddenly the case just got personal.

The body of a young woman is found on the streets of East London, in the shadow of the City's gleaming towers. No ID on her, just hard-earned cash. But there is no doubting the ferocity of the attack. DI Simon Fenchurch takes charge but, as his team tries to identify her and piece together her murder, they're faced with cruel indifference at every turn - nobody cares about yet another dead prostitute.

When Ella Longfield overhears two attractive young men flirting with teenage girls on a train, she thinks nothing of it - until she realises they are fresh out of prison and her maternal instinct is put on high alert. But just as she's decided to call for help, something stops her. The next day, she wakes up to the news that one of the girls - beautiful, green-eyed Anna Ballard - has disappeared.

How far would you go to protect your family? Single dad Ben is doing his best to raise his children, with the help of his devoted mother, Judi. And then Ben meets Amber. Everyone thinks this is a perfect match for Ben, but Judi isn't so sure.... There's just something about Amber that doesn't add up. Ben can't see why his mother dislikes his new girlfriend. And Amber doesn't want Judi anywhere near her new family. Amber just wants Ben and the children.

You think you know the truth about the people you love. But one discovery can change everything.... Eight-year-old Billy goes missing one day, out flying his kite with his sister, Rose. Two days later he is found dead. Sixteen years on, Rose still blames herself for Billy's death. How could she have failed to protect her little brother? Rose has never fully recovered from the trauma, and one of the few people she trusts is her neighbour Ronnie, who she has known all her life.

Newly married Natasha has the perfect house, a loving husband, and a beautiful little girl called Emily. She’d have it all if it wasn’t for Jen, her husband’s ex-wife who just won’t leave them alone. Then Natasha returns home one day to find her husband and Emily gone without trace. Desperate to get her daughter back, Natasha will do anything even if it means accepting an offer of help from Jen.

Meet DI Hillary Greene, a police woman fighting to save her career. Not only has she lost her husband, but his actions have put her under investigation for corruption. Then a bashed and broken body is found floating in the Oxford Canal. It looks like the victim fell off a boat, but Hillary is not so sure. Her investigation exposes a dark background to the death. Can Hillary clear her name and get to the bottom of a fiendish conspiracy on the water?

Laura has it all. A successful career, a long marriage to a rich husband, and a 23-year-old son, Daniel, who is kind, handsome and talented. Then Daniel meets Cherry. Cherry is young, beautiful and smart, but she hasn't had the same opportunities as Daniel. And she wants Laura's life. Cherry comes to the family wide-eyed and wants to be welcomed with open arms, but Laura suspects she's not all that she seems.

On a wet Monday in January, Jess Mount receives the devastating news that she hasn't got long left to live. She doesn't hear it from a doctor, though. She discovers it when her Facebook timeline skips forward 18 months and family and friends start posting tributes to her - following her death.

Moments before she dies, Nicola's grandmother Betty whispers to her that there are babies at the bottom of the garden. Nicola's mother claims she was talking nonsense. However, when Nicola's daughter finds a bone while playing in Betty's garden, it's clear that something sinister has taken place.

Not everyone who's missing is lost. When two teenage girls go missing along the Irish border, Paula Maguire has to return to the hometown she left years before. Swirling with rumour and secrets, the town is gripped by fear of a serial killer. But the truth could be even darker. Not everyone who's lost wants to be found. Surrounded by people and places she tried to forget, Paula digs into the cases as the truth twists further away. What's the link with two other disappearances from 1985? And why does everything lead back to the town's dark past - including the reasons her own mother went missing years before?