Criminal psychologist Audrey Harte is returning home after seven years. Less than 24 hours later, her best friend is murdered. Now, Audrey is both the prime suspect and the only person who can solve the case...It Takes One is the opening to a thriller series where a criminal psychologist uses her own dark past to help law enforcement catch dangerous killers.

Eighteen years ago, FBI Agent Rachel Ward's mirror twin, Hannah, was taken by the Gemini killer, a serial killer who delights in sending photos of his victims to their twins. Rachel assumes her sister has been dead for years, but she's never stopped hunting the monster who took her. Now, another twin has been taken, and when the case reopens, Rachel is assigned as an agent. But her relentless hunt for the killer may drive her to her breaking point.

Tracy Crosswhite has spent 20 years questioning the facts surrounding her sister Sarah’s disappearance and the murder trial that followed. She doesn’t believe that Edmund House - a convicted rapist and the man condemned for Sarah’s murder - is the guilty party. Motivated by the opportunity to obtain real justice, Tracy became a homicide detective with the Seattle PD and dedicated her life to tracking down killers.

In the remote forests of Stillwater, Minnesota, you can scream for days and no one will hear you. So when the bodies of two 15-year-old girls are discovered frozen in the snow, Special Agent Nikki Hunt is sure the killer is local: Someone knew where to hide the girls and thought they would never be found. Though Nikki hasn’t been home in 20 years, she knows she must take over the case.

As dusk approaches a small Dublin suburb in the summer of 1984, mothers begin to call their children home. But on this warm evening, three children do not return from the dark and silent woods. When the police arrive, they find only one of the children gripping a tree trunk in terror, wearing blood-filled sneakers, and unable to recall a single detail of the previous hours. Twenty years later, the found boy, Rob Ryan, is a detective on the Dublin Murder Squad and keeps his past a secret.

Erika Cass has a perfect family and a perfect life. Until the evening when two detectives show up at her front door. A high school girl has vanished from Erika's quiet suburban neighborhood. The police suspect the worst - murder. And Erika's teenage son, Liam, was the last person to see the girl alive. Erika has always sensed something dark and disturbed in her seemingly perfect older child. She wants to believe he's innocent, but as the evidence mounts, she can't deny the truth - Liam may have done the unthinkable.

Lieutenant Abby Mullen is no stranger to crisis. As the hostage negotiation instructor for the NYPD, she deals with worst-case scenarios every day. Nothing fazes her anymore. That all changes when she gets a call from Eden Fletcher, a fellow survivor of the infamous Wilcox cult. The two haven’t spoken since the night of a tragic, fiery massacre, when their paths diverged. But now Eden needs Abby’s help: someone has kidnapped her son and is demanding a $5 million ransom. As Abby throws herself into the case, she can’t help but wonder why the kidnapper has targeted Eden.

Escaping from a madman should have been the end of her nightmare. Instead it was only the beginning...Lizzy Gardner was just seventeen when she was kidnapped by the psychopath known as Spiderman, a serial killer terrorizing her California hometown. Imprisoned and tormented for months, Lizzy narrowly escaped with her life and Spiderman vanished without a trace. But if she thought he would forget her, she was dead wrong.

Three Chicago women have been found strangled, embalmed, and posed as if still alive. Doubting the findings of the local PD’s profiler, the FBI calls on forensic psychologist Zoe Bentley to investigate. Zoe quickly gets off on the wrong foot with her new partner, Special Agent Tatum Gray. Zoe’s a hunter, intense and focused; Tatum’s a smug maverick with little respect for the rules.

It was supposed to be the perfect reunion: six university friends together again after twenty years. Host Ali finally has the life she always wanted, a career she can be proud of and a wonderful family with her college boyfriend, now husband. But that night her best friend makes an accusation so shocking that nothing will ever be the same again.

Cassie thinks she has met the perfect man. Joel is sweet, handsome, romantic, and best of all, he’s crazy about Cassie. She thinks she’s found the guy she’ll spend the rest of her life with. Have children with. Grow old with. Yes, she knows about his perfect ex-girlfriend, Francesca. The beautiful, brilliant chef, beloved by all his friends. But she thinks Francesca is out of the picture. She thinks Francesca is gone for good. Think again, Cassie.

Charley sees dead people. That's right, she sees dead people. And it's her job to convince them to "go into the light." But when these very dead people have died under less than ideal circumstances (i.e., murder), sometimes they want Charley to bring the bad guys to justice. Complicating matters are the intensely hot dreams she's been having about an Entity who has been following her all her life...and it turns out he might not be dead after all. In fact, he might be something else entirely.

Three children, running in the woods behind their school, stumble upon a partially buried female body, eyes and mouth glued shut. Close behind the children is their teacher, Anne Navarre, shocked by this discovery and heartbroken as she witnesses the end of their innocence. What she doesn't yet realize is that this will mark the end of innocence for an entire community, as the ties that bind families and friends are tested by secrets uncovered in the wake of a serial killer's escalating activity.

When she was sixteen years old, Angela Wong—one of the most popular girls in school—disappeared without a trace. Nobody ever suspected that her best friend, Georgina Shaw, now an executive and rising star at her Seattle pharmaceutical company, was involved in any way. Certainly not Kaiser Brody, who was close with both girls back in high school.

On her first day of kindergarten, five-year-old Tinsley disappeared without a trace... Five agonizing years later, her divorced mother, Dani Callahan, is a private investigator. She and Quinn Sullivan, a promising young assistant determined to prove herself, are devoted to helping others find missing loved ones. And for Dani, finding Tinsley is still a never-ending obsession.

Skye Kellerman was attacked in her own bed. She managed to fend off her knife-wielding assailant, but the trauma changed everything about her life. As a result of that night, she joined two friends in starting an organization to help victims of crime.

But now...Her would-be rapist is getting out of prison. Skye knows that Dr. Oliver Burke hasn't forgotten that her testimony cost him his reputation - and his freedom.

Sacramento detective David Willis, who investigated her case, believes Burke is a clear and present danger - and guilty of at least two unsolved murders. And now Burke is free to terrorize Skye again. Unless David can stop him. Unless Skye can fight back.

New Orleans Detective Quinn Conners is haunted by her father’s whiskey-soaked, last words—that he solved the Hudson murder and kidnapping. It wasn’t the first time he’d made that drunken claim, and she didn’t believe him. Twenty-four hours later she found him dead by his own hand.

When Liv Dugan ducks out of work for lunch, it's just an ordinary day. When she returns, she stumbles onto a massacre. All her colleagues at Zuma Software have been shot. Only luck has left Liv unscathed, and that might be running out....

Ten years ago... Special Agent Jess Harris has closed another tough case, and now she's determined to make it home to spend Christmas with her only family, her sister. Jess needs a break, and taking it far away from work is the only way to keep her mind off the many faces of evil waiting in the stack of case files on her desk. Running into the past wasn't part of the plan... Daniel Burnett was Jess' first love. She'd fallen hard for him in high school. Together they'd gone off to college with big dreams.

Thriller scribe Sophie Katz is as hard-boiled as a woman who drinks Grande Caramel Brownie Frappuccionos can be. So Sophie knows it's not paranoia, or post-divorce, living-alone-again jitters, when she becomes convinced that a crazed reader is sneaking into her apartment to reenact scenes from her books. The police, however, can't tell a good plot from an unmarked grave.

Regulars at Nadia’s nature lodge don’t ask what she does in the off-season. And that’s a good thing. If she told them, she’d have to kill them. She’s a hit woman for a Mafia family. Tough and self-sufficient, Nadia doesn’t owe anyone any explanations. But that doesn’t mean she always works alone. One of her contacts has recruited her in the hunt for a ruthlessly efficient serial killer cutting a swath of terror across the country. The assassin is far too skilled to be an amateur - and the precision of the killings is bringing the Feds much too close to the hit man community for comfort.

Savannah Wilde is the first of her sisters to return to Midnight, Alabama when a grueling case leads the young prosecutor to seek shelter in the quiet of the once grand Wilde mansion. But when she finds letters casting doubt on her family's dark, shameful past, she realizes that peace in Midnight is a shallow façade and sinister secrets lurk beneath the surface. Protecting her is Zach Tanner, once the town's bad boy, now the new police chief - and he still has a wild hold over her.

When Mattie Winston catches her husband, Dr. David Winston, receiving some very special loving care from RN Karen Owenby, she quits her job and moves out. Mattie's best friend, Izzy, offers her a place to stay and suggests she'd be a natural as deputy coroner. Now, instead of taking patients' pulses, Mattie's weighing their hearts and livers. But Mattie's first homicide call turns out to be for none other than Nurse Karen, and even though she saw her ex in a heated argument with the newly deceased the night before, she refuses to believe David could be a killer.

Defense attorney Henry Garrison expected his newest case to be an easy paycheck. But his client Gillian Murphy is nothing like he expected. There's much more to the beautiful woman than he imagined. Gillian knows that she's innocent and that Henry is the best lawyer to represent her. But he doesn't know why she's so fascinated with him. He wonders if any woman can break through his well-placed walls. As the case takes a wild turn and Gillian's entire life is upended, her very identity in question, she must look to the people she's closest to in order to find a killer....

Twenty-four-year-old Olivia Taylor Jones has the perfect life. The only daughter of a wealthy, prominent Chicago family, she has an Ivy League education, pursues volunteerism and philanthropy, and is engaged to a handsome young tech firm CEO with political ambitions. But Olivia’s world is shattered when she learns that she’s adopted. Her real parents? Todd and Pamela Larsen, notorious serial killers serving a life sentence.

A crippling knee injury forced Elliot Mills to trade in his FBI badge for dusty chalkboards and bored college students. Now a history professor at Puget Sound university, the former agent has put his old life behind him, but it seems his old life isn't finished with him.

Detective Peter Decker of the LAPD is stunned when he gets the report. Someone has shattered the sanctuary of a remote yeshiva community in the California hills with an unimaginable crime. One of the women was brutally raped as she returned from the mikvah, the bathhouse where the cleansing ritual is performed.

At the end of a long winter in well-to-do Ridgedale, New Jersey, the body of an infant is discovered in the woods near the town's prestigious university campus. No one knows who the baby is or how her body ended up out there. But there is no shortage of opinions.

When hardworking attorney Clare Westbrook learns that her ambulance-chasing boss has been murdered, she's shocked - but not exactly surprised. Harvey Kredd was known for his less-than-ethical business dealings, and even his acts of generosity were tinged with greed. Clare, working at Kredd and Associates to pay off the law school loan Harvey had granted her several years before, knows she's got no choice: indentured servitude, twenty-first-century style.

It was inescapably chilling, as if the murderer was methodically working his way down a page torn from the phone book. The three victims brutally killed in their own homes had one thing in common: They were all listed as M. Douglas. The fact that Mara Douglas is next on the list has her jumping at shadows, until FBI agent Aidan Shields shows up to make sure she doesn't become the fourth victim.