Broken-hearted after a tragic accident killed her husband and daughter, Hettie Shaw, in her mid-fifties, finds escape in the arms of younger men. When military-trained, Sir Charles reluctantly hires Hettie to solve a blackmail case, it leads to a growing partnership. Their investigation causes a chain reaction that reveals a sinister web surrounding the Welsh town. As they dig deeper, Hettie bites off more than she can chew, and only Gran's words of wisdom from beyond the grave stop Hettie from becoming a murder victim herself.

Set in present-day Wales, UK., free-spirited, PI Hettie Shaw is a feisty, fun, femme fatale, who strides into every situation with head high and a druid insight at full throttle. When troubled Lady Gwen falls to her death from Castle Cliff, everyone thinks she committed suicide. But, when the police accuse her twin brother, Lord Ambrose of murder, he hires Sir Charles and Hettie Shaw to clear his name. As they investigate the twisting trail through the underbelly of Wales, it leads Hettie to insist they exhume the bodies of Lord Ambrose's parents, which uncovers a terrible family secret.

Meanwhile, Charles is battling his own problems with his new fiancé—an out-of-control spendthrift. Finally, the brutal murder of a young girl leads them to a dungeon where both Hettie and Charles race against time to save themselves from falling victim to the deadly killer.