Haven’s Rock is a sanctuary town hidden deep in the Yukon for those who need to disappear from the regular world. Detective Casey Duncan and her husband, Sheriff Eric Dalton, are starting a family now that they’ve settled into their life here. As Casey nears the end of her pregnancy, she lets nothing, including her worried husband, stop her from investigating what happens in the forbidden forest outside the town of Haven’s Rock. When one of the town's residents is drugged and wanders too close to the edge of town, she’s dragged into the woods kicking and screaming.

After slipping 150 years into the past, modern-day homicide detective Mallory Atkinson has embraced her new life in Victorian Scotland as housemaid Catriona Mitchel. Although it isn’t what she expected, she's developed real, meaningful relationships with the people around her and has come to love her role as assistant to undertaker Dr. Duncan Gray and Detective Hugh McCreadie. Mallory, Gray, and McCreadie are on their way to the Scottish Highlands for McCreadie's younger sister's wedding.

Nicola Laughton never expected to see adulthood, being diagnosed with Cystic Fibrosis as a child. Then medical advances let her live into her thirties and she met Anton, who taught her to dream of a future… together. Months after they married, Anton died in a horrible car crash, but lived long enough to utter five words to her, “I’ll be waiting for you.” That final private moment became public when someone from the crash scene took it to the press—the terminally ill woman holding her dying husband as he promised to wait for her on the other side.

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.