When she was 12, Leyna Clarke watched her older sister, Grace, walk away from their Sierra Nevada foothills home with her boyfriend, Adam Duran. Neither was ever seen again. Sixteen years later, a stranger who looks like Grace shows up at the restaurant where Leyna works --- and vanishes soon after. Leyna's mother, Meredith, still lives in the family’s old home, even if she claims to believe the police’s theory that Grace and Adam were willing runaways. Down the street, Adam’s mother, Olivia, has also stayed, determined to be there when her son finally returns…and to prove that Meredith and Leyna have been hiding something all these years. But the past isn’t the only threat to the two families, or the missing girl. As a wildfire sparks, tempers flare and intentions turn deadly.

Julia Bennett has worked hard to create a stable life for her daughter, Cora. So when Cora leaves for college, the worst thing Julia expects on move-in day is an argument with her ex-husband and his new wife. But a sudden attack leaves the campus stunned --- and only Julia’s quick actions save Cora’s life. Shaken in the aftermath and haunted by a dark secret, Julia starts to wonder: What if the attack wasn’t as random as everyone believes? Newly pregnant Ren Petrovic is a trained assassin. She wasn’t on campus that day but knows who was: her husband, Nolan. What she doesn’t know is why Nolan has broken their rules by not telling her about the job in advance. Who really hired Nolan? And why did one woman in the crowd respond so differently from all the rest?

Frankie Barrera has always been fiercely protective of her younger sister, Izzy. But over the years, Izzy’s risky choices have tested Frankie’s loyalty. Never so much as on a night five years ago, when a frantic phone call led Frankie to the scene of a car accident --- and a drunk and disoriented Izzy who couldn’t remember a thing. Though six friends partied on the outskirts of town that night, one girl was never seen again. Now, an AMBER alert puts Frankie in the sights of the local police. Her truck has been described as the one used in the abduction of a girl from a neighboring town. And the only other person with access to Frankie’s truck is Izzy. This time around, Frankie will have to decide to what lengths she’s willing to go in order to protect Izzy.

Driving home one rainy night, Cassie Larkin sees a man and woman fighting on the side of the road. Against all reason and advice, she gets out of her minivan and chases after the violent man, trying to help his victim. When Cassie physically tries to stop him, he suddenly turns on her and spits out an ominous threat: “Let her die, and I’ll let you live.” A veterinarian trained to heal, Cassie can’t let the woman die. But while she’s examining the unconscious victim, the attacker steals her car. Now he has her name and address, and knows about her children. The next day --- Halloween --- her husband disappears while trick-or-treating with their six-year-old daughter. Are these disturbing events a coincidence or the beginning of a horrifying nightmare?