Ellingham Academy is a famous private school in Vermont for the brightest thinkers, inventors, and artists. It was founded by Albert Ellingham, an early 20th century tycoon, who wanted to make a wonderful place full of riddles, twisting pathways, and gardens. "A place," he said, "where learning is a game." Shortly after the school opened, his wife and daughter were kidnapped. The only real clue was a mocking riddle listing methods of murder, signed with the frightening pseudonym "Truly, Devious".

Felicia, a single mother and lawyer by day, volunteers at a local crisis center to give back to her tightknit community in a small Wisconsin town. One night, she answers a horrifying call: through tears, a frantic teenage girl tells her that she was a victim of sexual assault at a local house party. Felicia is shocked, and breaking protocol, she begins communicating with the girl on her own, determined to keep her safe and hold her assailants accountable. But as she gets closer and closer to the truth, she can’t shake the feeling that she and the girl are connected by more than the phone call.

Emma hasn't told her husband much about her past. He knows her parents are dead and she hasn't spoken to her sisters in years. Then they lose their apartment, her husband gets laid off, and Emma discovers she's pregnant—right as the bank account slips into the red. That's when Emma confesses that she has one more asset: her parents' house, which she owns jointly with her estranged sisters. They can't sell it, but they can live in it. But returning home means that Emma is forced to reveal her secrets to her husband.

Eve has a good life. She wakes up each day, kisses her husband Nate, and heads off to teach math at the local high school. All is as it should be. Except… Last year, Caseham High was rocked by a scandal involving a student-teacher affair, with one student, Addie, at its center. But Eve knows there is far more to these ugly rumors than meets the eye. Addie can’t be trusted. She lies. She hurts people. She destroys lives. At least, that’s what everyone says. But nobody knows the real Addie. Nobody knows the secrets that could destroy her. And Addie will do anything to keep it quiet…

Eleanor Jones has just started at her ninth high school in less than five years. Since she and her mum are always moving on, Eleanor likes to stay on the outer, to stay invisible. So maybe it's just bad luck that the very first person she talks to at Cooinda Secondary College, Angus Marshall, is stabbed and left for dead the same day. The last message on Angus's phone is from Eleanor Jones.

Oliver Marks has just served 10 years in jail - for a murder he may or may not have committed. On the day he's released, he's greeted by the man who put him in prison. Detective Colborne is retiring, but before he does, he wants to know what really happened a decade ago.

Sixteen-year-old Charlotte is convinced her life would be perfect if she could only get past the one obstacle holding her back: a girl named Bellany Silverfield, who seems to have it all - beauty, popularity, power, and the boy of Charlotte’s dreams. But when Bellany is murdered, Charlotte’s life doesn't get any better.

Medical student Amy Brenner is spending the night on a locked psychiatric ward. Amy has been dreading her evening working on Ward D, the hospital’s inpatient mental health unit. There are very specific reasons why she never wanted to do this required overnight rotation. Reasons nobody can ever find out. And as the hours tick by, Amy grows increasingly convinced something terrible is happening within these tightly secured walls.

When a chance encounter sparks an unlikely bond between rival murderers Sloane and Rowan, the two find something elusive—the friendship of a like-minded, pitch-black soul. From small-town West Virginia to upscale California, from downtown Boston to rural Texas, the two hunters collide in an annual game of blood and suffering, one that pits them against the most dangerous monsters in the country.

When Crystal Donavan gets a message on a mysterious app with a picture of her little sister gagged and bound, she agrees to play the kidnapper’s game. At first, they make her complete bizarre tasks: Steal a test and stuff it in a locker, bake brownies, make a prank call. But then Crystal realizes that each task is meant to hurt—and kill—her friends, one by one. But if she refuses to play, the kidnapper will kill her sister.