After mystery author Diane Christie loses her husband to suicide, she and her son move to the small coastal town of Fog Harbor, Massachusetts. Her daughter is attending college nearby, and Diane hopes that her family can now begin to heal. But rebuilding their lives after the tragedy isn't so simple. Diane's depressed college-age daughter, Alexa, still avoids her, critical of everything Diane does, and even her generally amiable teenage son, Josh, has started acting out.

Dr. Daniel Winters has a beachfront home in Malibu, a career as a respected pediatrician, and a gorgeous new wife, Mia. For a man whose past was rife with mental illness, addiction, and thoughts of suicide, it seems too good to be true. Then Daniel learns that a fellow pediatrician and his family were found slaughtered in their home. It’s just the first chip in the facade of Daniel’s perfect life. Little by little, everything starts to fall away. At work, his career becomes at risk when he’s asked to remain silent about a dangerous new drug. At home, Mia has gone from an affectionate newlywed to a mysterious woman carefully hiding secrets.

On Halloween night five years ago, Chelsea Dutton's college roommates were viciously stabbed to death, and Chelsea was critically injured. She was found hiding in her apartment's bathtub, barely clinging to life. With only fragments of shattered memory, she's been trying her best to move past the nightmares ever since. Now in Boston, she lives a somewhat reclusive life, working from home as a medical transcriptionist and bingeing on mindless television shows.

On a humid summer day in Alabama, a mayor’s wife turns up brutally murdered under a railroad bridge. Standing next to her body is fourteen-year-old Mason Hill, the autistic son of former Miss USA Genevieve Hill. The locals are quick to level their verdict on young Mason: he did it. The town detective calls in local autism expert Casey Walker to consult on the case. At first, Casey tries to keep an open mind. But the more time she spends with Genevieve, the more her unease grows, and she suspects that Genevieve is doing more than just protecting her son.

Abandoned by her fugitive ex-husband, Lily Brown is rebuilding her life on the edge of a Kansas town that still feels the sting of his crimes. Lily lies low, managing the isolated storage facility where she lives with her twelve-year-old son, Everett, and planning a better future for them both. That requires keeping secrets. Everett has them too. After breaking into a storage unit, Everett finds photographs and news clippings of five girls missing for decades.

Helen lives a decent, uncomplicated life. Satisfied in her career, she’s raising three happy teenagers, and her family has the most envied house on the street. Admittedly, she’s growing just a little disenchanted with her marriage to her workaholic husband, Werner. But that’s nothing she can’t fix. For disaffected, young petty criminals Ralf and Brian, it was a scheme to make some cash: a quick home invasion. The targets they’ve chosen are Helen and Werner. Just as planned, Brian disappears into Helen and Werner’s house. And he never comes out again.

Taryn Moore is young, beautiful, and brilliant…so why would she kill herself? When Detective Frankie Loomis arrives on the scene to investigate the girl’s fatal plunge from her apartment balcony, she knows in her gut there’s more to the story. Her instincts are confirmed when surprise information is revealed that could have been reason enough for Taryn’s suicide - or a motive for her murder. 

Twenty years ago Emily Mills's father was murdered, and she found his body hanging in the backyard. Her younger sister, Madison, claims she was asleep in her room. Her older sister, Tara, claims she was out with friends. The tragedy drove their mother to suicide and Tara to leave town forever. The killer was caught. The case closed. Ever since, Emily and Madison have tried to forget what happened that night - until an eerily similar murder brings it all back. 

Psychiatrist Dr. Gwen Moore is an expert on killers. She’s spent a decade treating California’s most depraved predators and unlocking their motives - predators much like the notorious Bloody Heart serial killer, whose latest teenage victim escaped and then identified local high school teacher Randall Thompson as his captor. The case against Thompson as the Bloody Heart Killer is damning - and closed, as far as Gwen and the media are concerned. If not for one new development.

Best friends Lindsey, Kendra, and Dani endure every parent’s nightmare when a tragic accident befalls their teenage boys, leaving one dead, another in a coma, and a third too traumatized to speak. Reeling from the worst night of their lives, the three mothers plunge into a desperate investigation of the bizarre incident. How could something so horrible happen in their wealthy Southern California suburb? They soon discover that the accident was just the beginning, and troubling discoveries lead to chilling questions: Do they really know their children? Do they even know each other?

Zoe didn't meet her daughter the way most mothers do. She finds five-year-old Maddie alone and dirty on a countryside road. Frightened for Maddie's safety, she picks her up and takes her back to her father, not knowing what she's about to step into. Because Maddie wasn't just lost; she was there to lure her serial killer dad's new victim. After escaping from the clutches of Maddie's dangerous father, she bonds with the little girl. Only Maddie knows what it was like to be at that house. And when no family members come forward to claim Maddie, Zoe decides to adopt her. 

Gemma Robinson comes into Elliot’s life like a whirlwind, and they marry and settle into his home. When she asks him if her parents can come to stay for a couple of weeks, he is keen to oblige - he just doesn’t quite know what he’s signing up for. The Robinsons arrive with Gemma’s sister, Chloe, a mysterious young woman who refuses to speak or leave her room.

Before Owen Michaels disappears, he smuggles a note to his beloved wife of one year: Protect her. Despite her confusion and fear, Hannah Hall knows exactly to whom the note refers—Owen’s sixteen-year-old daughter, Bailey. Bailey, who lost her mother tragically as a child. Bailey, who wants absolutely nothing to do with her new stepmother. As Hannah’s increasingly desperate calls to Owen go unanswered, as the FBI arrests Owen’s boss, as a US marshal and federal agents arrive at her Sausalito home unannounced, Hannah quickly realizes her husband isn’t who he said he was.

The Delaneys are fixtures in their community. The parents, Stan and Joy, are the envy of all of their friends. They’re killers on the tennis court, and off it their chemistry is palpable. But after 50 years of marriage, they’ve finally sold their famed tennis academy and are ready to start what should be the golden years of their lives. So why are Stan and Joy so miserable?

FBI special agent Zoe Spencer uses skeletal remains to recreate the faces of murder victims through sculpture. Though highly scientific, the process is also sensitive and intimate; she becomes attached to the individuals she identifies, desperate to find justice for each. As Zoe examines old remains, she sees a teenage girl looking back at her - the victim in a cold case from over a decade ago.