Gwendolen Harleth's precarious financial future hinges on her acceptance of a marriage proposal from a wealthy aristocrat whose past holds a disturbing secret.

Gwendolen, a beautiful but impoverished Englishwoman, finds herself responsible for her widowed mother and younger sisters after their family fortune is lost. Her limited options for securing their future are starkly highlighted when a chance encounter at a resort leads to a proposal from the wealthy and enigmatic Henleigh Grandcourt. Despite her attraction to him, Gwendolen uncovers an alarming secret about his past that threatens to complicate her decision and her future.

The novel appears to be a character-driven exploration of a young woman's choices in a restrictive historical period. The premise suggests a focus on the protagonist's internal struggles as she confronts societal pressures and personal danger. The narrative likely delves into the complexities of relationships, particularly the dynamics between Gwendolen and Henleigh Grandcourt, as she uncovers unsettling truths about him. The setting of the 1860s implies a rich historical backdrop against which these personal dramas unfold.