1923. American heiress Ruby Vaughn hoped the new year would bring less murder and far less of the occult, allowing her to spend her days at the rare book shop she runs alongside her octogenarian employer, and exploring her fledgling romance with Ruan Kivell, the intriguing folk healing Pellar she met in Cornwall. But fate often has other plans. Ruby has long believed her entire family died when the Lusitania sank in 1915, however when her solicitor brings news that her mother inexplicably survived the catastrophe and he believes he’s found her in a Belgian hospital just across the channel, Ruby dares not hope it’s true. For if there’s one thing Ruby Vaughn knows, it is that hope is the surest way to a broken heart.

With trepidation, Ruby and Ruan set off for Belgium with a simple task―to go to the hospital at Saint Oda’s priory, find her mother, and bring her home. However, upon her arrival at the priory, Ruby learns the woman they sought had died and been hastily buried days before. Stunned, Ruby refuses to believe that her mother is truly gone. Perhaps it is her jaded heart, or all the time she’s spent lady detectiving as her employer, Mr. Owen, calls it, but the more Ruby inquires into the woman’s fate, the more suspicious the death becomes and Ruby and Ruan fear that both the occult and murder are at work in Belgium. As Ruby unfurls the mystery surrounding the woman, she finds more missing souls and a sinister secret that has been simmering at Saint Oda’s since the Great War and it’s up to Ruby to find the truth.