Dr. Theo Cray has a legendary mathematical knack for catching serial killers. Until his exposure to a mind-altering pathogen knocks him off his game. It has upended an investigation, destroyed his reputation, and left him to question his own sanity. One person still trusts him to finish the job. His former professor Amanda Paulson is helping point Cray down a logical path to his prey: a nomadic health-care worker whose murder spree stretches back decades and whose victims number in the hundreds.

Professor Theo Cray caught one of the most prolific serial killers in history using revolutionary scientific methods. Cut off from university research because of the shroud of suspicion around him after the death of his former student and the aftermath of catching his quarry, Cray tries to rebuild his life but finds himself drawn into another unsolved case. The desperate father of a missing child, ignored by the authorities and abandoned by his community, turns to Theo for help. The only clues are children's drawings and an inner-city urban legend about someone called the Toy Man.

Professor Theo Cray is trained to see patterns where others see chaos. So when mutilated bodies found deep in the Montana woods leave the cops searching blindly for clues, Theo sees something they missed. Something unnatural. Something only he can stop. As a computational biologist, Theo is more familiar with digital code and microbes than the dark arts of forensic sleuthing. But a field trip to Montana suddenly lands him in the middle of an investigation into the bloody killing of one of his former students.

Coming from scandalous Florida treasure hunters and drug smugglers, Sloan McPherson is forging her own path, for herself and for her daughter, out from under her family’s shadow. An auxiliary officer for Lauderdale Shores PD, she’s the go-to diver for evidence recovery. Then Sloan finds a fresh kill floating in a canal - a woman whose murky history collides with Sloan’s. Their troubling ties are making Sloan less a potential witness than a suspect. And her colleagues aren’t the only ones following every move she makes. So is the killer.

FBI agent Jessica Blackwood believes she's left her complicated life as a gifted magician behind her - until a killer with seemingly supernatural powers puts her talents to the ultimate test. A hacker who identifies himself only as "Warlock" brings down the FBI's website and posts a code in its place that leads to a Michigan cemetery, where a dead girl is discovered rising from the ground - as if she tried to crawl out of her own grave.

Lady Emily Hardcastle is an eccentric widow with a secret past. Florence Armstrong, her maid and confidante, is an expert in martial arts. The year is 1908 and they've just moved from London to the country, hoping for a quiet life. But it is not long before Lady Hardcastle is forced out of her self-imposed retirement. There's a dead body in the woods, and the police are on the wrong scent. Lady Hardcastle makes some enquiries of her own, and it seems she knows a surprising amount about crime investigation...

When a joint FBI-Seattle Police investigation of an international child pornography ring gets too close to certain powerful people, sex-crimes detective Livia Lone becomes the target of a hit that barely goes awry - a hit that had been offered to John Rain, a retired specialist in "natural causes." Suspecting the FBI itself was behind the attack, Livia reaches out to former Marine sniper Dox. Together, they assemble an ad hoc group to identify and neutralize the threat. There’s Rain. Rain’s estranged lover, Mossad agent and honeytrap specialist Delilah.

Clare Cassidy is no stranger to murder. As a literature teacher specialising in the Gothic writer R. M. Holland, she teaches a short course on it every year. Then Clare's life and work collide tragically when one of her colleagues is found dead, a line from an R. M. Holland story by her body. The investigating police detective is convinced the writer's works somehow hold the key to the case.s....  

Nora Kelly, a young curator at the Santa Fe Institute of Archaeology, is approached by historian Clive Benton with a once-in-a-lifetime proposal: to lead a team in search of the so-called "Lost Camp" of the tragic Donner Party. This was a group of pioneers who earned a terrible place in American history when they became snow-bound in the California mountains in 1847, their fate unknown until the first skeletonized survivors stumbled out of the wilderness, raving about starvation, murder - and cannibalism.

When a church combusts in rural Appalachia, the bizarre trail of carnage suggests diabolical forces are at work. Charged with explaining the inexplicable, the FBI's Dr. Ailes and Agent Knoll once again turn to the ace up their sleeve: Agent Jessica Blackwood, a former prodigy from a family dynasty of illusionists. After playing a pivotal role in the capture of the Warlock, a seemingly supernatural serial killer, Jessica can no longer ignore the world - and the skills - she left behind.