In Legacy of Cain, sisters Eunice and Helena lead a seemingly idyllic life under the care of their father, the Reverend Abel Gracedieu. However, their world is turned upside down when buried secrets from their past begin to emerge. One sister, adopted, grapples with the haunting legacy of a mother executed for her husbands murder. As the mistress and brother of the slain man enter their lives, a gripping chain of events unfolds, forcing one sister to confront the painful truths of her heritage. Who will rise to face the darkness that looms over them? - Summary by Carolin