Detective Matt Ballard

When Matt Ballard was starting out his career, three boys were murdered in the same area, the remote and bleak Gibbet Fen. When the main suspect was killed in a hit-and-run, the killings stopped. But Matt was not satisfied that the real murderer had been caught. Over 25 years later, Matt gets a photo in an unmarked envelope. It's of the Gibbet Fen crime scene. And the picture was taken before the murder took place. More photos arrive, relating to the historic murders, as well as intimate pictures of Matt's very secret private life.

Grace Repton, a beautiful older woman, walks into the police station to tell Detective Matt Ballard she has information that could stop a murder. Her fiance, the infamous serial killer Jeremy Reader, has told her that he has a disciple who is going to kill using Reader's horrific methods. Reader murdered five women and was finally brought to justice by Detective Ballard. Reader is safely imprisoned in a high security prison, and claiming to be a reformed man who wants to help the police.

As the mists roll over the fens and enigmatic lights twinkle in the distance, only the locals know their way along the hidden paths through the mysterious watery terrain of one of England's most beautiful and sometimes dangerous places. Detective Matt Ballard may have retired but there's still plenty going on in the fens to keep him busy. Someone trashes an old lady's garden and daubs her isolated cottage with hateful graffiti. Emilia Swain seems to be totally harmless, so why is she being targeted?

An old friend's sister disappears without a trace. There's no sign of foul play, but she'd been acting very peculiarly. Meanwhile, Liz's cousin, Christie, comes to stay. She takes an immediate - and uncharacteristic - dislike to the local bookshop owner, Gina. Why does everyone put up with her awful behavior? Christie is convinced that Gina is manipulating everyone around her. Is she onto something dangerous or just pushing her new friends away? No one believes her suspicions until another friend goes missing late at night on the misty Fen marshes.

Photography student Toby Unsworth has found the location for the perfect night-time shoot. A cobbled street in the old part of Fenfleet. Later, when he looks at the images on his laptop, he thinks he sees a woman's face in the window of an old, disused building. He asks his housemate Alex to come and take a look . . . Two days later, Toby and Alex are dead. Carbon monoxide poisoning. An unfortunate accident. But Alex's mother doesn't believe it. She hires Matt and Liz to find out the truth.

Matt is intrigued when his partner Liz brings home an old carpet bag she found dumped in the local library. It contains a pile of mysterious handwritten notes. Liz is convinced the bag belongs to Old Molly, a local woman who lives on the streets. The following day, a body is discovered in a marshy lagoon. It's Old Molly. Suffocated with an expensive men's handkerchief. Molly clearly knew something that got her killed. Liz believes she was trying to tell them something important. She calls on her nephew David to help decipher the carpet bag notes.