A beautiful woman, Faith Collins, runs wildly onto a bridge. Faith is frantic; everywhere she turns she's spooked by imaginary horror. From her point of view, everything is distorted, as inanimate objects are coming to life. As a car moves across the bridge, it hits a distracted Faith, sending her flying onto the pavement. The driver, Leroy, stumbles out of the car and hurries to Faith's mangled body; she's still breathing!
Leroy looks up to find a dark figure hovering above him, obscured by the shadows on the bridge. The figure tells him to hurry up and call 911, which Leroy does, and he rushes back to his car. Meanwhile, the figure kneels next to Faith as she looks up at him. At first, there's fear in her eyes, but as he moves closer and he gently strokes her skin, her eyes fill with delight. The figure bends as if to kiss her, but then covers her nose and mouth, steadily suffocating her. When Leroy returns to find Faith's dead body, the dark figure is nowhere to be seen.
Nick arrives at the crime scene and Sgt. Wu fills him in on the situation. They question Leroy, who explains that the man who told him to call 911 disappeared into the night. They find glass in her arm, and it didn't come from the accident. Hank and Nick wonder, what was she running to? Or perhaps, what was she running from? At the morgue, Harper's on the case. The team quickly discovers that someone suffocated Faith after she was hit by the car; her death wasn't a result of the accident.
Hank and Nick pay a visit to Faith's husband, Ray Collins. With a history of spousal abuse, Ray is looking to be their primary suspect. But Ray is genuinely affected by the news of his wife's death and didn't know her whereabouts the night she left home.
With a little help from Facebook, the detectives uncover that Faith was at the Bramble Haus Bed and Breakfast the night she died. They pay the inn a visit and come across Billy Capra, 40s, an affable, average-looking guy. Billy's cooperative in nature and tells the detectives that he remembers the girl; he showed her a room and the garden before she left.
The detectives check out the garden he mentioned, and it's truly a beautiful oasis. But strangely enough, the garden is populated by colorful little toads. Billy picks up a toad, and Nick catches him morphing into a goat-like creature with mischievous eyes and a neatly trimmed goatee. Billy, however, doesn't know that Nick saw him morph. After Nick and Hank leave, Billy pops the toad in his mouth and eats it!
Later, Nick is in his aunt's trailer, paging through the books. He comes across various illustrations of goat-like creatures that resemble Billy when he morphed. Through reading, he learns that these goat creatures, called Ziegevolk or Bluebeards, are able to put young women under some sort of spell, allowing oafish men to attract poor young women.
Nick goes to his trusty resource, Monroe, for further insight. Monroe reveals that Ziegevolk secrete a scent that women find irresistible. If one of them touches you, it owns you. Bluebeards are herders; they like to have a lot of females hanging on their every word, especially during "rutting season" when they gather females for breeding.
Nick and Hank find that there have been a cluster of missing women in Portland in the last month and decide to look in to a possible pattern. Turns out that in multiple states, clusters of women go missing and are then eventually found pregnant. All 17 women in question were DNA tested, and it turns out it was the same father for every one. They're not dealing with a serial killer; they're dealing with a serial breeder.
Meanwhile, Billy enters the basement of the Bramble Haus with a tray of three nice meals. He delivers the dinners, placing the plates of food on the floor. As he exits, three hands reach out, grab the plates and pull them back. It would appear that Billy is keeping three poor women in custody.
Nick tracks Billy to a bar, where he enlists Monroe to listen in on his conversations. Monroe fills Nick in on his Bluetooth as he watches Billy seduce a woman, Lisa, at the drop of a hat. Lisa practically melts in his lap, a euphoric smile on her face. Billy hands his card to the woman and exits the bar, making his way back to the bed and breakfast.
Meanwhile, Hank breaks in to the B&B to investigate the situation further. He goes into the basement and discovers the three poor women caged like animals, but he is knocked out by a leaking gas before he can respond. Nick tries to call Hank to warn him of Billy's return, but he's too late; Hank is out cold. When Billy returns to the B&B, he is quickly met by Lisa, unable to resist his tempting offer to see the inn.
Nick finds Hank and the women in the basement, but before he can take action, Billy catches him in the act and locks them in, turning up the gas. The two manage to break down the door, but they're too late; Billy has already made off with Lisa.
The three women in the basement are safe now, but Hank and Nick still have work left to do. The detectives track Billy's car to viewpoint, where Billy is admiring a waterfall with Lisa. When Billy sees Nick and Hank arrive, he makes a run for it, only to get hit by an oncoming truck.
In the aftermath, Nick and Hank watch as Billy, still alive, is loaded onto a gurney by paramedics. As Billy looks up weakly at the female paramedic, we see her immediately become taken with him. He may be caught this time, but Billy's manipulative ways are clearly far from over.