Widowed genealogist Ellie McLellan has spent years healing her ravished heart by carefully constructing a new and quiet life away from the hungry glare of the paparazzi. She now fills her days with genealogical research for various clients, safe in the small town of Percyville, Quebec. Until her bid to save a child's life is caught on camera and ambitious tabloid reporter Diane Cooper recognizes her. Turns out Ellie is not safe at all. With Diane sniffing around for dirt and her "big break" story, Ellie learns a dark family secret with the power to destroy the only family she has left.

Maggie Gilbert and her children, Jack and Alice, live a pretty normal life. That is, until Maggie starts looking into her family tree. In doing so, she uncovers a dark mystery that endangers her children. She has to solve the mystery in the past, if she is to save her family in the present. Together with a fellow genealogist, Zelah, Maggie unearths more and more details about the drowning of a small girl and the unsolved disappearance of Maggie's ancestor.

London, 1941: Miss Jane Treen is at her desk, strong black coffee in hand and fluffy ginger cat by her side, when her top-secret government work is interrupted by an urgent call to Devon. A woman has been found dead in a lake in a place where she shouldn’t have been. Jane needs to gather the clues and find the killer before someone else from the agency gets hurt… Shy and handsome code-breaker Arthur Cilento is bewildered by the arrival of the efficient Miss Treen and her cat Marmaduke.

The job presented to forensic genealogist, Morton Farrier, ought to have been simple and easy. But the surprise discovery of an additional marriage to his client’s father leads Morton on an enquiry, revolving around a mysterious death in the county asylum. Requiring his various investigative genealogical skills, Morton must work to unravel this complex 80-year-old secret and finally reveal the truth to his client.

Hours later, the man’s cold body lies in the city mortuary, alongside the woman he couldn’t save. And his sister, unconventional nurse Gemma Tate, tracks down troubled police inspector Sebastian Bell to unravel the truth. Sebastian has enough pressure to solve the murder of an aristocratic heiress without Gemma meddling in his case. But the cryptic sentences she brings him from her brother’s notebook could be a crucial lead. If only they knew what “milky way” meant.