When a building bursts into flames on a cold winter night in Washington, DC, investigators see a resemblance to a string of recent fires in the area. There is one difference, however: this one has a human casualty. The local team insists they're looking for a young white male, suffering from an uncontrollable impulse to act out his anger or sexual aggression.

For decades, tired travellers have stopped at rest areas on America's epic highways to rest, refuel, and get a bite to eat, but little do they know that one man's rest stop is another's hunting ground. For years the defenceless, the weary, and the stranded have been disappearing along the highways and byways, vanishing without a trace. When FBI special agent Maggie O'Dell and her partner, Tully, discover the remains of a young woman in a highway ditch, the one clue left behind is a map that will send Maggie and Tully on a frantic hunt crisscrossing the country to stop a madman before he kills again

K9 handler Ryder Creed and his scent dog, Grace, return to Nebraska to join FBI Agent Maggie O'Dell on the same task force that helped rescue his sister Brodie a year ago. But their job is interrupted when a rural postal carrier finds a black plastic bag discarded in a grassy roadside ditch. What's inside is shocking to even these seasoned investigators. Just that morning, a young woman had gone missing. Is her disappearance connected? Did she run away? Or was she taken? And is it only a matter of time before she ends up in a roadside ditch?

On a crisp Autumn evening in western Nebraska, what started as a group of kids filming their drug-fuelled party ends in an explosive light show, leaving the victims apparently electrocuted, with odd scorch marks being the only evidence. While Maggie O'Dell tries to make sense of the different stories, sifting through what is real and what is hallucination, she realises that the surviving teens are being targeted and systematically eliminated.

Special Agent Maggie O'Dell doesn't even need to set foot at a crime scene to catch a serial killer. Then comes Albert Stucky...and nothing will ever be the same. Stucky is a sadistic madman who places pieces of his victims in takeout containers and leaves them for innocent bystanders to find. He enjoys his twisted games as much as he enjoys the kill. And when Maggie is tasked with profiling his murders, Stucky is only too happy to rise to the challenge.

Ryder Creed and his dogs have been making national headlines after intercepting several major drug stashes being smuggled through Atlanta's airport. But their newfound celebrity has also garnered some unwanted attention. When Creed and one of his dogs are called in to search a commercial fishing vessel, they discover a secret compartment. But the Colombian cartels' latest shipment isn't drugs.

During a training exercise, Creed’s scent dog, Grace, is drawn off course and discovers a shallow grave. The body was never meant to be found, hidden deep in an isolated part of Florida’s Blackwater River State Forest. The remote area has no easy access in or out. The killer obviously hoped his secret would be scattered and swallowed up by the forces of nature. 

In Alabama: A deadly outbreak of tornadoes sends K-9 handlers Ryder Creed and Jason Seaver with their scent dogs, Grace and Scout, to search for survivors. As storms intensify and Ryder and Jason race against time to save victims, they end up racing to save themselves. In Chicago: Francine "Frankie" Russo is irritated when her young co-worker calls at 5:00 a.m. for a video-chat and catches her in only a towel. She's so annoyed with Tyler Gates that she’s barely paying attention when two men confront him on the street. In a matter of seconds, Frankie witnesses Tyler’s murder.

Most of them were asleep in their beds when the ground gave way.... When Ryder Creed responds to a devastating mudslide in North Carolina, he knows the difference between finding survivors and the dead is time. Heedless of the dangers, Creed and his best search-and-rescue dog, Bolo, are frantically wading through the chaos of twisted tree limbs, crumbled cement, and unrecognizable debris when a second slide catches up with Ryder.

On the way to Isle of Palms, a barrier island off the South Carolina coast, forensic anthropologist Temperance Brennan receives a call from the Charleston coroner. During the storm, a medical waste container has washed up on the beach. Inside are two decomposed bodies wrapped in plastic sheeting and bound with electrical wire. Chillingly, Tempe recognizes many details as identical to those of an unsolved case she handled in Quebec 15 years earlier.