Near the turn of the nineteenth century, Dr. Thornhollow helps teenaged Grace Mae escape from the Boston asylum where she was sent after becoming pregnant by rape, and takes her to Ohio where they put her intelligence and remarkable memory to use in trying to catch murderers.

When seventeen-year-old Piper Gray starts a true crime podcast investigating a seventeen-year-old murder cold case, she puts her life in danger as she digs deep into the mysteries of the past.

"Senior year at Ellingham Academy for Stevie Bell isn't going well. With the cold case of the century solved, Stevie is adrift. There is nothing to distract her from the questions pinging around her brain--questions about college, love, and life in general. Relief comes when David invites Stevie and her friends to join him for study abroad, and his new friend Izzy introduces her to a double-murder cold case. In 1995, nine friends from Cambridge University...

Relates the efforts of teens Elayah, Liam, Jorja, and Marcie to solve a 1986 murder, and the actions of their then-teenaged parents leading up to the crime.

When Aerin is kidnapped by a killer she knows all too well, her friends Seneca, Maddox, and Madison have four days to solve a series of related cases in order to secure her release.

When Stevie Bell is finally able to return to Ellingham Academy after identifying the culprit in the murder of a classmate, she begins to wonder if the case was really resolved and attempts to uncover the truth about the school's founder. Stevie Bell seemed to be on the cusp of the decades-old kidnapping and murder of Albert Ellingham's family. But a classmate's murder-- which Stevie solved-- convinced her parents to pull her out of Ellingham Academy....

Ten years after leaving Cooley Ridge, Nicolette Farrell returns to care for her ailing father. A decade ago, she, her brother Daniel, her boyfriend Tyler, and Corinne's boyfriend Jackson were suspects when Corinne-- Nic's best friend-- disappeared without a trace. Within days of Nic's return, they are plunged into a shocking drama when Nic's neighbor Annaleise, who is dating Tyler and was the group's alibi ten years previously, goes missing....

Sixteen-year-old Maddie Flynn cannot help but see the death date of everyone she meets or sees in a photograph or on-screen, and her alcoholic mother exploits this by having her do readings for money, but when Maddie predicts the death of a young boy, she becomes the center of an FBI investigation.

As sixteen-year-old Kippy of Friendship, Wisconsin, reads her best friend Ruth's diary, she is shocked at what she learns and spurred to solve Ruth's murder, certain that the boy who was arrested is innocent.

While investigating a series of grisly murders, eighteen-year-old palace nurse Hyeon navigates royal and political intrigue and becomes entangled with a young police inspector. Includes author's note.