Working at the Horse Farm, a facility outside of Nashville that assists patients with mental and physical recovery, Olivia (Liv) Gordon has loved her job and felt safe, but now people are dying with Liv seeing a horse and rider, wearing a soldier's garb, in the night sky.

When a man is murdered in the alley behind her place, she's dismayed when his spirit appears, too, asking for help. FBI agent Dallas Samson has a passionate interest in the murder, since the victim's a colleague whose death is connected to the smuggling ring known as Los Lobos: the wolves. Unaware that Dallas has certain abilities of his own, Hannah calls her cousin Kelsey O'Brien, a member of the FBI's Krewe of Hunters, an elite unit of paranormal...

When Amy Larson and her partner Hunter Forrest investigate a missing persons case in a series of caves outside Denver, Colorado, they discover a muddy pit littered with corpses that are covered in human bite marks and find the case leading them to a cult.

One night, New York FBI agent Aiden Mahoney receives a visitor in a dream, an old friend named Richard Highsmith. The very next day he's sent to Sleepy Hollow because Richard's gone missing there. Maureen "Mo" Deauville now lives in the historic town and works with her dog, Rollo, to search for missing people. She's actually the one to find Richard, or more precisely his head, stuck on a statue of the legendary Headless Horseman. Mo and Aiden, a new...