Meanwhile, Gillan McArdle’s academic career is ending because of one stupid lapse of judgement. Offered a short-term contract, he lands on the Hebridean island of Harris to investigate obscure animal bones. Quickly dismissing the unicorn skull as a thinly disguised fake, he can’t deny there’s something unusual about these bones. Baited by rumors of a majestic tusked horse roaming the uplands, Gill begins to suspect someone is manipulating him. As he gradually unravels the mystery of the skull, he grasps a disturbing conclusion: If this creature does exist, the evidence suggests it’s a killer.

D.I. Duncan McAdam is dispatched home to the Misty Isle. A body has been found buried in a remote location on the Waternish peninsula. Well-preserved in the peat, Isla Matheson—missing for the better part of two decades—is revealed to a shocked island community. A teenage runaway is dead...and no one is talking.

When the chief suspect in the notorious "peekaboo cop killer" case blew himself up, almost taking lead investigator DCI Duncan Bone with him, the psychologically damaged detective thought his days on the force were over. But, when another PC is abducted and murdered in the same deranged peekaboo fashion, Bone is persuaded to return to lead the new investigation.

Erebus Resort, occupying a magnificent, hundred-thousand acre valley deep in the Colorado Rockies, offers guests the experience of viewing woolly mammoths, Irish Elk, and giant ground sloths in their native habitat, brought back from extinction through the magic of genetic manipulation. When a billionaire's son and his new wife are kidnapped and murdered in the Erebus back country by what is assumed to be a gang of eco-terrorists, Colorado Bureau of Investigation Agent Frances Cash partners with county sheriff James Colcord to track down the perpetrators.

Met cop DI Rob Marshall is hot on the trail of the serial killer known as the Chameleon, who has abducted, tortured and killed a series of young women in Northwest London. As they close in, the Chameleon—who switches identity to get close to his victims—shoots Marshall’s partner and escapes.

A man’s body washes up on a beach on the North Yorkshire coast with a single gunshot wound to the chest. The only clue to the victim’s identity is a ring engraved with two names. DCI Tom Raven is back in his hometown of Scarborough for the first time in over 30 years. When offered the chance to lead the murder investigation, he takes it. Raven quickly discovers that the prime suspect is his once-teenage friend, now a wealthy but shady businessman. He finds an ally in Detective Sergeant Becca Shawcross, but not everyone in the team is on his side.

Thomas Austin was once a prominent NYPD detective, known for locking up a psychopathic serial killer dubbed "The Holiday Baby Butcher". Now retired in a small beach town in the Pacific Northwest, Austin runs a little café, trying to overcome the loss of his wife, a DA who was gunned down only one year ago.

As the sole survivor of the car crash that killed her parents, grief-stricken paramedic Kit MacKlenna is stunned to learn her life is built on lies. A legacy from her father includes a faded letter and a well-worn journal. The journal reveals she was abandoned as a baby 160 years ago. The only clues to her identity are a blood-splattered shawl, a locket with the portrait of a 19th century man, and a Celtic brooch with magical powers.

Across the Pacific Northwest, a twisted killer stalks victims representing ancient archetypes: The Ruler. The Warrior. The Scholar. The Priest. Four are dead, leaving FBI investigators puzzled by the macabre, color-coded shrines the killer left behind. And clues now point to a fifth victim.

A sinking boat is spotted off the South Coast. Waiting onboard is a grisly discovery. DCI Boyd, recently relocated from London to Hastings, is now with the East Sussex CID, and his first case is that of a local businessman and his new young wife, missing in the English Channel. All that remains of them is a grim scene aboard their half-submerged yacht and a digital trail of clues that could put Boyd and his daughter, Emma, in danger.

On a desolate beach in far northern Scotland, the winter storms have been washing up all manner of things since time began. But buried in the centre of one smaller iceberg is a shard of ancient Viking pottery telling a partial tale of a hidden mysterious island beyond the ice and mist, that was home to a great treasure and even greater horrors. Thawing in the same block of ice was a rotting flap of skin that refused to be identified but had similar skin patterns to a creature not seen for 100 million years.

After Cassie MacGuire’s husband dies in a plane crash along with her father, both her and her mother, Lily Bennett, are left as widows. Looking to make a new start, they move together to the quiet seaside town of Hideaway Bay. But their new home, Whispering Manor, has a reputation stretching back centuries. Legends of ghosts, paranormal disturbances, and pirate treasure are all associated with the former sea captain’s mansion, starting with the death of its first mistress, Henrietta Blanchard.

Shy, introverted Dr. Cate Kensie never imagined that she would inherit a beautiful, and oddly quirky, castle nestled in the picturesque Scottish Highlands. Truthfully, she was sure that she didn’t have any family left after her parents died in a car accident several years before, but then, she had gotten the phone call, and her entire world had turned upside down.

When Glasgow law student David Hunter survives a mysterious attack, he discovers he's a descendant of a long line of witches known as Dream Dancers. Thrust into a hidden world of magic, government conspiracies, and perilous quests, David must master his newfound abilities to protect the mystical Akashic Records—the key to humanity's past, present, and future. Alongside the fiery Jessica Campbell, wise Aunt Gen, and the underworld creature Terence, they face malevolent forces aiming to manipulate reality.

Detective Constable Angus MacVicar has just landed his dream job – transferred out of uniform and assigned to Oldcastle’s biggest ongoing murder investigation: Operation Telegram, hunting the “Fortnight Killer”. Every two weeks another couple is targeted. One victim is left at the scene, their corpse used as a twisted message board. The second body is never seen again. This should be the perfect chance for Angus to prove himself, but instead of working on the investigation’s front line, he’s lumbered with the forensic psychologist from hell.