When a young girl is discovered dead on an isolated Irish country road, it seems to be a simple hit and run. Then the cops see the tattoo on her back - a pair of beautifully wrought angel wings. Forensic investigator Reilly Steel is soon on the scene and she suspects that there is more to this case than a straightforward murder. Then the angel tattoo is traced to other children - both dead and alive - who are all similarly marked....

She always went to far. DS Alexandra Cupidi has done it again. She should have learnt to keep her big mouth shut after the scandal that sent her packing - resentful teenager in tow - from the London Met to the lonely Kent coastline. Murder is different here, among the fens and stark beaches. She was the one who found the killers. The man drowned in the slurry pit had been herded there like an animal. He was North African, like many of the fruit pickers that work the fields. The more Cupidi discovers, the more she wants to ask - but these people are suspicious of questions. 

Florence Lovelady's career was made when she convicted coffin-maker Larry Glassbrook of a series of child murders 30 years ago. Like something from our worst nightmares the victims were buried...alive. Larry confessed to the crimes; it was an open and shut case. But now he's dead, and events from the past start to repeat themselves. Did she get it wrong all those years ago? Or is there something much darker at play?

Lucy Black must protect the young and vulnerable... but can she protect herself? Late December. A 16-year-old girl is found dead on a train line. Detective Sergeant Lucy Black is called to identify the body. The only clues to the dead teenager's last movements are stored in her mobile phone and on social media - and it soon becomes clear that her 'friends' weren't what they claimed to be. Lucy is no stranger to death: she is still haunted by the memory of the child she failed to save, and the killer she failed to put behind bars.

Colm Healy used to be one of the Met's best detectives. Until, haunted by the unsolved murders of a mother and her twin daughters, his life was left in ruins. Missing persons investigator David Raker is the only friend Healy has left. The only one who understands that redemption rests on solving these murders. Their search will unravel a thread of tragedy spanning years and will force them to sacrifice everything they have left....