May 20, 2019: Homicide detective Mallory is in Edinburgh to be with her dying grandmother. While out on a jog one evening, Mallory hears a woman in distress. She’s drawn to an alley, where she is attacked and loses consciousness. May 20, 1869: Housemaid Catriona Thomson had been enjoying a half-day off, only to be discovered that night in a lane, where she’d been strangled and left for dead. When Mallory wakes up in Catriona's body in 1869, she must put aside her shock and adjust quickly to the reality.

Thorne Manor has always been haunted...and it has always haunted Bronwyn Dale. As a young girl, Bronwyn could pass through a time slip in her great-aunt's house, where she visited William Thorne, a boy her own age, born two centuries earlier. After a family tragedy, the house was shuttered and Bronwyn was convinced that William existed only in her imagination. Now, 20 years later Bronwyn inherits Thorne Manor. And when she returns, William is waiting.

Casey Duncan is a homicide detective with a secret: When she was in college, she killed a man. She was never caught, but he was the grandson of a mobster, and she knows that someday this crime will catch up to her. Casey's best friend, Diana, is on the run from a violent, abusive ex-husband. When Diana's husband finds her, and Casey herself is attacked shortly after, Casey knows it's time for the two of them to disappear again. Diana has heard of a town made for people like her, a town that takes in people on the run who want to shed their old lives.

Kennedy Bennett comes from a long line of curse weavers. For centuries, her family has plied their trade in Unstable, Massachusetts, an unconventional small town that's welcomed paranormal practitioners since the dawn of spiritualism. Kennedy has recently struck out on her own, opening an antiques shop in Boston, where her specialty is uncursing and reselling hexed objects. Then Aiden Connolly walks into her life with an offer she really should refuse. The scion of a wealthy family of luck workers, Aiden has a scheme to get his hands on the most famous cursed object of all.

She’s happy renovating homes and occasionally thumping bad guys until she learns of a mysterious artifact hidden under the house she’s working on. Everybody from humans to orcs to werewolves wants it, and they’re willing to kill to get it. Things go from bad to worse when someone frames her for murder.